To celebrate their newest romantic comedy, Blended, Barrymore and Sandler sang a sweet, silly (and a little bit raunchy) duet on The Tonight Show, with Jimmy Fallon playing guitar.
"Every 10 years, I promise to love you," Barrymore starts out. And later: "You are the Fred to my Ginger Rogers."
"You're the Rob Ford to my crack cocaine," Sandler replied.
Sandler then asks how he stacks up against Barrymore's other movie husbands: Hugh Grant and Ben Stiller don't hold a candle, but Barrymore's Fever Pitch co-star and Sandler "both have great qualities."
The song included a couple of references to their first film together, The Wedding Singer and ended with promises to keep their love -- on and off screen -- going forever.
Celebrity Couples of 2014 [PHOTOS]