Ashley Tisdale: Zac Efron

Whoa there, mister! “At the time, he was used to acting on, like, Warner Bros, which is the CW, and we were on Disney Channel,” Ashley, 39, recalled of Zac, 37, who tried to slip her the tongue during his 2006 guest spot on The Suite Life of Zack & Cody. “I was like, ‘Get away from me!’ I, like, closed my mouth so fast. I was like, ‘This is Disney Channel! We don’t kiss like that on Disney Channel!’”

Austin Nichols: Mary-Kate Olsen

On the April 13 ep of the Drama Queens podcast, the One Tree Hill alum shared his discomfort at smooching the much younger star, now 38, in the 2001 family vacay flick Holiday in the Sun. “I was definitely nervous, because Mary-Kate was 15, and I was, I think, 18 or 19 or maybe even 20,” the 45-year-old recalled, adding, “I don’t think you can tell there’s a big age difference, but from my brain, I was like, ‘She’s 15. This is weird.’”

Hugh Grant: Julia Roberts

Sure, she’s one of the world’s most beautiful women, but Julia’s Notting Hill costar wasn’t feeling it. Remembering the 57-year-old as “very big-mouthed”
when they filmed the 1999 rom-com, Hugh, 64, joked, “Literally, physically, she has a very big mouth. When I was kissing her, I was aware of a faint echo.”

Gwyneth Paltrow: Robert Downey Jr.

Nothing to see here! Their respective partners had nothing to worry about when the Iron Man costars locked lips in the 2008 movie. “With Robert, like, when I kissed him, I was like, ‘You’ve got to me kidding me,’” Gwyneth, 52, said of the 60-year-old. “This is literally like kissing my brother.”

Kate Hudson: Matthew McConaughey

Something always seems to go wrong for the two-time rom-com costars. “Every time I kiss McConaughey, I mean, it’s like there’s just something happening and there’s, like, snot or wind,” Kate, 46, griped of making out with the 55-year-old. “Like, when we were kissing, like, in the end of Fool’s Gold, we’re, like, in the ocean, we had the plane crash,
he just had snot all over his face.”