Before Britney was singing "Baby One More Time," the pop singer starred on the "Mickey Mouse Club" alongside Justin Timberlake.
Besides sharing matching jeans outfits on the red carpet (seriously, who can forget that?) the singer admitted that at age 13, she and Timberlake shared her first kiss.
DiCaprio wishes he could forget his first smooch.
"It was the most disgusting thing in my whole life," he said. "The girl injected about a pound of saliva into my mouth, and when I walked away I had to spit it all out."
Before her twerking days, Miley was just the daughter of her "Achy Breaky Heart" father Billy Rae Cyrus who was acting on the TV show "Doc."
That's where the 9-year-old met fellow actor Tyler Posey who also appeared on the show. According to Posey, the two shared a first kiss.
Most people hope that their first kiss will be a magical moment they will remember for years to come.
Unforutanely, for Alba that was definitely not the case.
"I was 12 years old and had to kiss this guy who was gross and never brushed his teeth," she shared.
While the supermodel's first kiss with husband Andy Roddick was "sweet" and "innocent," the first time she locked lips at age 12, there "was a lot of slobber, it was not good."
Kunis was only 14 when she starred alongside future boyfriend Ashton Kutcher on "That '70s Show" where she shared her first on and off screen kiss with the actor.
"I was like, 'Oh, he's so cute, it's the Calvin Klein model!'" the actress told PEOPLE in 2001. "Then I was like, 'I have to kiss him?' I was so nervous and uncomfortable. I had the biggest crush on him."
The "Call Me Maybe" singer was a late bloomer when it came to love.
"I waited for my first kiss. I waited until I was 17, and he was a jazz singer named Brenden Call," Jepsen told MTV. "Nice guy, sweet guy. We still keep in touch on Facebook. "
Pitt's first kiss was all business, no play.
"I was in the fourth grade," he said. "We made a plan to meet in her garage and kiss. It was like this business deal. I go right up to her, kiss her. Then I ran home."
Check out which stars dished on their first kiss.