Nope, he's not that Hemsworth! During The Tonight Show [1] on Wednesday, Isn't It Romantic [2] star Liam Hemsworth had a case of mistaken identity when he ran into host Jimmy Fallon [3] backstage. As the two greeted each other, Jimmy accidentally confused Liam with his older brother Chris [4] when he gushed about being a fan of the Avengers movies. And Jimmy wasn't the only one left feeling awkward. Liam proceeded to tell him how "his wife," [5] Miley Cyrus [6], was a huge fan of his show, The Big Bang Theory [7]. Of course, it's the last few seconds of the video that really made us LOL. Watch the video above!