Jennifer Lopez likes to win!

The "Booty" singer was a guest on Monday, Jan. 19 episode of The Tonight Show Starring Jimmy Fallon, and there was no disguising her competitive streak!

Paired up with the show host, the Lopez-Fallon team competed against Anthony Mackie and Steve Higgins for a very intense game of Catchphrase. Right from the start, Lopez took the contest incredibly seriously, complaining, "Oh why does he get to start?" when Fallon explained the rules.

And as she faced off against her teammate, she gave Fallon a quick pep talk, and a serious warning, "I don't like to lose!"

Wearing a super low-cut, pink satin shirt, Lopez went wild as she and Fallon played three, fast-paced rounds of the game, with both teams managing impressively high scores. Lopez leapt around despite her revealing outfit, bouncing up and down as she encouraged Fallon to guess her clues.

But as the timer started to speed up in the final round, Lopez got increasingly desperate to help Fallon guess her final clue, "Bottom Line."

Fortunately for the mom-of-two, Lopez is blessed with one of the most famous bottoms in Hollywood!

Watch the clip above and see whether Lopez's butt helped her team sail to victory or not.