“I was too old.”

And he recalls being anxious when they shot it for a very specific reason.

Nichols, who turned 21 before the movie arrived in stores, decided to do something about his discomfort.

Austin Nichols and Mary Kate Olsen pictured years after their on-screen kiss

Austin Nichols pictured in 2021 and Mary Kate Olsen in 2018, years after their on-screen kiss.Credit:Rodin Eckenroth/Getty

“I remember talking to producers, and I remember talking to even her dad was there.

I was like, ‘Is this OK with you guys?’

And they were all like, ‘Oh, don’t worry about it!’

Austin Nichols and Mary-Kate Olsen star in ‘Holiday in the Sun’

Austin Nichols and Mary-Kate Olsen star in ‘Holiday in the Sun’.Dualstar Productions/Warner Bros

It was all very G-rated.”

They met Nichols' Griffen Grayson at their resort in the Bahamas.

Bush, for one, thought Nichols had done the right thing.

James Lafferty as Nathan Scott, Bethany Joy Lenz as Haley James, Chad Michael Murray as Lucas Scott, Hilarie Burton as Peyton Sawyer, Sophia Bush as Brooke Davis

“They’re children,” Nichols said.

Even though it hasn’t always been his favorite.

“I had to give that up years ago because people love it.”

Mary-Kate Olsen and Ashley Olsen in ‘New York Minute’

Watch their full conversation above.