Source: Engaged Bijou Phillips Cheats On Fiancé Danny Masterson ... With A Girl? | Blink 182: Mark Hoppus Embarrasses Himself by Declaring Unreciprocated Love for Travis Barker | Straight Celebrities Rally Against Prop 8 Ruling... But Where Were the Gay Stars? | Pop Tarts Scene & Herd

Source: Engaged Bijou Phillips Cheats on Fiancé Danny Masterson... With a Girl?

Bijou Phillips is engaged to "That 70’s Show" alum Danny Masterson, but it seems the party princess/notorious wild child was more focused on the same sex while partying at Hollywood’s underground hotspot Ecco Ultra Lounge on Saturday night.

According to an inside source, Phillips was so pumped up by the mix Carmen Electra’s fiancé rocker Rob Patterson was spinning that she started grinding another mystery blonde girl in the booth adjacent to the DJ booth.

"It wasn’t long before they took things further," said our source. "Eventually Bijou grabbed the girl and they started making out and getting it on … Danny (Masterson) was nowhere to be seen."

A rep for Phillips did not respond for comment.

Blink 182: Mark Hoppus Embarrasses Himself by Declaring Unreciprocated Love for Travis Barker

So we’re all pretty pumped about Blink 182 reuniting for a national T-Mobile tour, but it sounds as though (married) lead singer Mark Hoppus has a little extra incentive to ensure the band stays friends this time after their infamous split in 2005.

"I’ve had to learn that when Travis says ‘I love you’ it doesn’t necessarily mean I love you love you, it just means I love you as my friend and not more than that," Hoppus told Tarts last week at the band’s intimate party at Hollywood’s El Compadre restaurant. "I just have to now hold back my feelings for him. This is the one good thing that’s happened to me in a really long time and I just want to make sure it stays."

Barker, who was standing right beside Hoppus, seemed a little uncomfortable and shot his band mate a WTF look - prompting Hoppus to go into damage control.

"Can he reference me and my love? On tour we spend as much time with one another as we do with our wives, we’re like brothers," Hoppus said quickly. "I feel like I’ve dug myself into an enormous hole with my joke about Travis and I’m trying desperately to redeem myself. I’m just going to stop talking for the benefit of all mankind, thank you."

Instead Barker was more at ease discussing the album that Blink is working to bring out next year and explains why the tickets to their summer tour are going for just 20 bucks.

"Because that’s all its worth," he said enthusiastically.

Straight Celebrities Rally Against Prop 8 Ruling... But Where Were the Gay Stars?

Hollywood was up in arms on Tuesday night after the California government ruled in favor of upholding Proposition 8 which prohibits same-sex marriage. Thousands and thousands took to the streets of West Hollywood to rally for gay/lesbian rights and while we spotted a slew of straight celebs including Drew Barrymore, Haylie Duff, Sophia Bush, Emmy Rossum, Eliza Dushku, Pete Wentz, Kelly Osbourne and Shanna Moakler we couldn’t help but wonder where and why Tinseltown’s gay stars didn’t make the same effort.

Lindsay Lohan instead spent the night holed up in on-again/off-again lover Samantha Ronson’s Hollywood Hills home while T.R. Knight was spotted at Katsuya restaurant with his boyfriend Mark Cornelsen.

Neil Patrick Harris? Ellen? Portia? Lance?

Pop Tarts Scene & Herd

Jamie Lee Curtis and Val Kilmer at Royal/T culinary destination in Los Angeles last Thursday.

Dancing with the Stars alum Emmitt Smith checking out the newly open Yogen Fruz on 14th Street in Washington, D.C. on Thursday.

Teri Hatcher celebrating her father’s 74th birthday at STK in Los Angeles on Friday.

Supermodel Christie Brinkley arriving fashionably late to Hamptons magazine’s Annual memorial Day party at Niche Media's Haley and Jason Binn's Southampton home on Saturday. Also in attendance was Susan Lucci, James and Kedakai Lipton, Real Housewives’ Jill and Bobby Zarin, and stepkids Ally Shapiro and Jonathan Zarin, Ramona and Mario Singer.

Bethenny Frankel mixing Skinnygirl Frangelinis for guests at the Miracle House 19th Annual Memorial Day Kick-Off in N.Y. on Saturday night.

Kylie Minogue telling party-goers including James Blunt and Hayden Panettiere about the importance of ridding Africa of Malaria at the Miracle Africa International Charity event in Cannes, France on Saturday.

Molly Sims and a group of her closest girlfriends celebrating her 36th Birthday on Saturday with a 3 hour dinner and a surprise birthday cake at the Montauk Yacht Club. N.Y. Housewife Bethenny Frankel and John Legend were also spotted at the swanky club.

Mark Wahlberg and his wife checking out the Lakers game at the bar at STK Los Angeles. Gina Gershon, Elisha Cuthbert and boyfriend, Calgary Flames player, Dion Phaneuf and Taryn Manning were all later spotted in the popular restaurant.

Ben Stiller dining at N9NE Steakhouse at The Palms in Sin City before heading upstairs to the Playboy Club on Sunday evening.

Good Charlotte front man Joel Madden playing guest DJ on Sunday night at The Bank nightclub at Bellagio, joining his twin brother Benji (who hung out with UFC's most popular ring girl Arianny Celeste). Also spotted was Tyrese Gibson, Toni Braxton, Nelly and Big Boi.

Ellen Pompeo and Chris Ivery lounging at the Bagatelle Beach Club at The Gansevoort Hotel in Turks & Caicos before kayaking at sunset.

Anna Paquin picking up vintage bustiers at Collette before heading to Day +Night beach club at Pink Elephant to celebrate Memorial Day weekend at her Hamptons magazine cover party on Sunday.

Tiësto, the number one DJ in the world, delivering his signature sensational set on Sunday night at JET Nightclub inside The Mirage. Earlier in the day, Tiësto surprised pool partiers at BARE pool lounge at The Mirage when he took over DJ duties from Val Kolton, Madonna’s DJ.

Susan Sarandon and Tim Robbins watching Rock of Ages on Sunday evening. "The City" starlet Whitney Port saw NYC's hit show the night before while the N.Y. Jets new QB Mark Sanchez was spotted in the audience on Friday night.

Ben Stiller celebrating his number one movie at the box office "Night at the Museum: Battle of the Smithsonian" with a stay in a two-bedroom penthouse at Palms Place Hotel & Spa and a special breakfast with some friends at Simon at Palms Place on Monday morning.

Michael Clarke Duncan donning a John Cena "Hustle, Loyalty, Respect" baseball hat ringside at the Staples Center for WWE’s Monday Night RAW.

Mike Richards the Captain of the Philadelphia Flyers who is up for the Selke Award (top Defensive Forward in the league) had lunch at Simon at Palms Place on Tuesday.

Drew Barrymore, Kelly Osbourne and Haylie Duff joining the ranks of thousands and thousands on the streets of West Hollywood on Tuesday night to rally against the California state government for upholding Proposition 8 which prohibits same-sex marriage.

NHL Captain for the Philadelphia Flyers, Mike Richards, dining at N9NE Steakhouse inside Palms Casino Resort Tuesday night.

Kate Bosworth at the TeaZazz sponsored REEL Recovery Film Series in LA Tuesday night. Bosworth promptly left after the screening/Q&A session of indie-cult fave, Ivansxtc, to go outside for a cigarette with a bevy of Brit male model types including beau James Rousseau.

Robert Pattinson and Kristen Stewart making out on the set of "New Moon" in Montepulciano, Italy on Wednesday.