Celebrity Sightings: Sofia Vergara, Bar Refaeli, Blake Lively and More...

Sofia Vergara, Paula Patton, and Shenae Grimes checking out the opening of Monika Chiang’s new West Hollywood boutique on Monday, October 10, where attendees made time to shop Monika’s debut collection and left with multiple shopping bags in tow.

Sean Parker (of Napster and Facebook fame) hosting an exclusive party to celebrate the “f8” announcement of the Facebook and Spotify partnership, with guests including Mark Zuckerberg and performances by The Killers, Jane's Addiction, Snoop Dogg and Kaskade. Held in San Francisco on Thursday, September 22, key music VIPs including Parker, Spotify's Daniel Ek, and industry manager Paul Rosenberg held a panel that discussed the future of music and impact of social media.

Ryan Seacrest, Julianne Hough, Darren Criss, Ty Burrell, Jesse Tyler Ferguson, Eric StonestreetDr. Dre, and Mia Tyler toasting to the completion of the iHeartRadio music festival in Las Vegas on Saturday, September 24 at Light Group's Haze nightclub inside the Aria hotel.

Heidi Klum, Bar Refaeli, Rufus Wainwright, John Legend, Lindsay Lohan, Chanel Iman, Natasha Poly, Roberto and Eva Cavalli, and Margherita and Teresa Missoni gathering to support the fight against AIDS at the third annual amfAR Milano benefit in Milan, Italy on Sunday, September 25.  The black-tie gala and live auction, held in conjunction with Milan Fashion Week, raised over $1.4 million for amfAR, The Foundation for AIDS Research.

Blake Lively sipping a “blood” martini and playing with tarot cards while previewing the Renaissance Hotel and Madame Tussauds "Dare to Check In" Halloween suite on Wednesday, October 5 in New York City.   The limited edition suite will be available to consumers over Halloween weekend for a price tag of $5,000 a night, and includes spooky cocktails, cupcakes, and free horror movies throughout your stay.

NYLON Magazine, along with A|X Armani Exchange, celebrating the magazine's October "It Girl" issue with a private dinner hosted by cover star Lizzie Olsen, who was joined by her older sisters, Mary-Kate and Ashley Olsen, at Sons of Essex in New York City on Wednesday, October 5.

Reese Witherspoon loyally sticking by her husband Jim Toth’s side all evening while mingling with guests such as Jeremy Piven, Camila Alves, Matthew McConaughey, Eli Roth, and Molly Sims at the second annual Art Mére / Art Pére Night, hosted by Jim Toth, presented by Corzo Tequila and Ferrari. The evening of cocktails and art, held at Smashbox Studios in Los Angeles on Thursday, October 6, benefitted the Livestrong foundation.

Michelle Williams and Jake Gyllenhaal stepping out on Sunday, October 9 in New York City, to catch a screening of The Weinstein Company’s latest film “My Week with Marilyn” at Grey Goose’s celebration, which honored the 49th annual New York Film Festival with Dior. Guests sipped cocktails including the Grey Goose Pear Flower and the Grey Goose Red Velvet before the screening.

Co-hosts Rachel Zoe and Rodger Berman joining attendees Zoe Saldana, Camilla Belle, Sofia Vergara, Ali Larter, Jeremy Piven, Selma Blair, Adam Sandler, Jaime King, Lauren Conrad, Lo Bosworth, and Greg Kinnear at the second-annual Veuve Clicquot Polo Classic at the Will Rogers State Historic Park on Sunday, October 9 in Los Angeles. Guests noshed on savory bites from various food trucks while sipping flutes of Veuve Clicquot champagne.

Hosts Charlize Theron and famed celebrity photographer Randall Slavin joining close friends and supporters on Wednesday, October 12 in Los Angeles for an intimate cocktail party featuring the world premiere of Slavin’s celebrity photo series, “REACH: 24 Portraits to benefit the Charlize Theron Africa Outreach Project.” Sarah Silverman and Michael C. Hall spent much of the night chatting with Charlize Theron about HIV/AIDS prevention care methods in Africa. Although an evening supporting a serious cause, the comedienne kept conversation light-hearted and had Charlize and friends laughing throughout the night.

Whoopi Goldberg, Al Roker, Julian Lennon (son of John Lennon), Stephen I. Sadove (Chairman and Chief Executive Officer of Saks Fifth Avenue), Natalie Morales, and Gayle King stepping up to support the millions of individuals around the world affected by lupus during the second annual Lupus Foundation of America’s Butterfly Gala in New York City on Tuesday, October 11.

Will.i.am making a grand entrance after arriving via helicopter at the second annual Rob Dyrdek Foundation Benefit, held at Dyrdek’s “Fantasy Factory” in Los Angeles on Saturday, October 15. In addition to Will.i.am’s performance, the Far East Movement also treated the star-studded crowd to a performance while guests noshed on specialty ice cream bars, tacos, and hot dogs.

Madonna sipping Krug champagne, with her boyfriend by her side, at the Krug House in NYC on Sunday, October 15.