February 28th, 2014
12:23 PM ET
Drew Barrymore's relationship with Adam Sandler can sometimes only be expressed through song.
So when the frequent co-stars - who've appeared in "The Wedding Singer" and "50 First Dates" together - appeared on "The Tonight Show starring Jimmy Fallon" Wednesday, they decided to duet about their bond.
Typically when Fallon's guests step up to the mic, it's for a silly song that's meant to be laughed at, not listened to earnestly. But with Barrymore and Sandler, even the purposefully bad lyrics couldn't distract from their very real affection for one another.
And we mean platonic affection, people: both of these actors are married with kids, with Barrymore very clearly ready to welcome her second child any day now. But on-screen in their romantic comedies, "every 10 years we get to fall in love again," Barrymore said.
Thus was born the inspiration for their song "Every 10 Years," which they performed with Fallon playing guitar.
"You made me laugh in 'The Wedding Singer ... you're the Fred to my Ginger Rogers," Barrymore sang. "You're the Rob Ford to my crack cocaine," Sandler replied.
There was a little contention over which actor was Barrymore's best movie husband - Fallon also starred with Barrymore in "Fever Pitch" - but in the end, Barrymore and Sandler pledged to love each other when they're old.
Watch it to the end - it gets really sweet:
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