We Got EXCLUSIVE PICS And Videos . . . From Rapper Nelly CELEBRITY BIRTHDAY WEEKEND In Las Vegas . . . Kelly Rowland . . . Bobby Brown . . . Miss Jackson Plus LOTS MORE!!

Nelly was at Las Vegas top nightclub Drai's this weekend, both Friday and Saturday, to celebrate his birthday. MTO was in the building and it was a MOVIE. Tons of celebrities were there - and most were gracious enough to PERFORM for the audience.

Here are some pics and video from the festivities. Happy birthday to the BIG HOMIE Nelly.

Kelly performed, and sang Dilemma with Nelly:

Bobby Brown stopped by, and entertained the audience with a MIMI-CONCERT:

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Chingy was there:

So was Jermaine Dupri and the Young Guns:

Rapper Freeway:

Manny Fresh performing:

And here's the whole club singing Nelly happy birthday:

Nelly’s manager J Erving announced his new and upcoming tour, the Nelly and Friends Tour which will include surprise performers like this past weekend with Kelly Rowland, Bobby Brown and Jermain Dupri