Jay-Z keeps his cool in even the most awkward situations. On Sunday night at the MTV Video Music Awards, rapper and "America's Best Dance Crew" judge Lil Mama came onstage during Jay-Z and Alicia Keys' performance unannounced and uninvited.

While Jay was ending his final "Empire State of Mind" verse, Mama came up from her seat in the crowd onto the stage and started bobbing her head to the beat. Jay looked surprised but continued to bop to the beat and even kept rapping. Hov patted Mama on the leg to fall back and even threw in a quick joke, saying, "You T-Paining right now," while Keys finished her chorus. The line refers to T-Pain jumping onstage with Jay-Z at Summer Jam during his "D.O.A. (Death of Auto-Tune)" performance. While Pain said he was asked to get on with the Jiggaman, Jay said in interviews he had no idea the singer was coming out with him.

In Mama's case, she didn't pay attention to Jay's gesture. When it came time to take a triumphant pose at the end of "Empire State of Mind" — a pose meant for Jay and Alicia Keys — Mama came up to the front and stood beside her peers and even did a b-girl pose next to them.

Since her surprise appearance, Mama has caused quite a stir on Twitter. At press time, "#Lilmamais" was the top trending topic.

Fabolous got in on the Twitter fun with a few updates. "#Lilmamais like the dude that parachutes down on the field during a game!" Fab tweeted. "#Lilmamais gonna get security at the stages of every award show from now on. #Lilmamais the bird that flew outta Lady Gaga's nest on her face!!"

Neither Lil Mama nor Jay-Z could be reached for comment at press time.

The 2009 MTV Video Music Awards might have wrapped, but the party is far from over. Stay tuned for behind-the-scenes updates, party reports and much more.