Ashanti & Nelly Do the Birthday Dance

R&B superstar Ashanti knows how to party ... birthday party that is.

Ashanti celebrated her 26th birthday over the weekend in Las Vegas at the celebrity equivalent of Chuck E. Cheese for birthday parties -- TAO nightclub at the Venetian.

Ashanti's "good friend" Nelly played the role of erotic dance partner, doing a little bump and grind with the b-day girl to Nelly's hit song "Shake Ya Tailfeather." But the highlight of the evening came when the DJ cranked up one of Ashanti's hits and brought out the cake. As fans gathered and snapped pics, Ashanti and Nelly smiled uncontrollably while everyone ate the cake.

We can't wait 'til her 27th birthday.