Justin Timberlake, Jessica Biel and Jimmy Fallon casually broke into a Hamptons house over Memorial Day weekend earlier this year.

Biel and Fallon shared the story on “The Tonight Show” Tuesday when the actress stopped by to promote her new USA drama "The Sinner." The crazy weekend excursion started out innocently when they wanted to check out an open house in the area.

“Nancy [Fallon] and I were hoping to go in and so we dragged you guys,” Biel said.

Fallon noted that him and Timberlake were bro-biking around town that morning and showed up a few minutes later to see their wives inside the home without any people or a real estate agent.

“We go in and we’re looking for your bikes and we don’t even see your bikes anywhere and we were like, we didn’t know what was happening so we pulled our tandem bike over and we got out and we’re looking for you guys and there was no one, your bikes were around the house,” Fallon said. “And then we saw that you guys were in the house, but you weren’t supposed to be in the house.”

Biel said she felt guilty about it, but still checked every door at the house until she found one that was left open. And once inside, they figured they might as well stick around to check out every room in the home, which was so big it had a basement screening room and pool house.

“I don’t know why we did it, but it was so much fun,” Fallon said.

Bro-biking. @jimmyfallon 🚲 #memorialdayweekend

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