Jimmy Fallon And Barbra Streisand Sing Medley of Duets

The late-night host, 39, sang an incredible medley of duets with the legendary singer-actress, 72—even standing in for Elvis Presley, Blake Shelton and Michael Bublé!

And he gave quite a performance! Wearing an over-the-top Elvis-inspired wig, super-sized shades and a flashy red scarf, the Tonight Show host did the late King of Pop justice with his rendition of "Love Me Tender."

Babs was really impressed, though, when Jimmy, wearing a cowboy hat à la Blake, joined her in a duet performance of "I'd Want It To Be You."

"I can hardly tell the difference," she told Jimmy. "That was actually good!"

And when it came time to be Bublé, the late-night host pulled through once again. Trading his cowboy hat for a formal bow tie like the Canadian crooner often wears, Jimmy joined Barbra on "It Had to Be You," and they even worked a few dance moves into the routine!

But as impressed as Babs was with Jimmy's skills, she playfully told him, "Don't give up your night job!"

"Actually," she clarified, "I'm very impressed with you. My husband [James Brolin] and I watch you all the time, and you're very musical and really good. So, I was just making a joke at your expense!"