Jennifer Aniston has a bit of a nasty streak -- and we love it!

The actress, who is coming off more risque roles in movies like "Horrible Bosses" and the upcoming "We're the Millers," was one of the presenters at Saturday night's 2013 Guys Choice Awards for Spike TV -- where she unloaded on Funniest M.F. Award recipient Jimmy Kimmel.

"Jimmy what a year you've had. You got to host the Emmys, must be so fun to finally meet all the stars who won't do your show," she said after comedian Jeff Ross told her to turn up the heat on Jimmy.

Then came a great jab referencing her engagement to Justin Theroux, who was not in attendance.

"Jimmy you've got a lot going on in your life," Aniston continued. "Like me, you got engaged this year, unlike me, nobody cares."

The kicker to her speech: "And here's something that no one has ever said before, 'I can't wait to see Jimmy's package' Roll it!"

It was all in good fun, of course, and we can't wait to watch it when the show airs June 12 on Spike TV.

The event was packed with other stars as well -- including Bradley Cooper, Ben Affleck, "Man of Steel" stars Amy Adams and Henry Cavill, Joseph Gordon-Levitt, Vince Vaughn, Mark Wahlberg, Jessica Alba, Jake Gyllenhaal and even a real live giraffe!

Check out all the wild party pics above!

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