Beyonce: Eldridge Sister of Solange Knowles

Beyonce comes out to support younger sister Solange Knowles‘ DJ set at NYC hot spot The Eldridge on Tuesday night (January 26).

“B and Jay-Z were having a blast,” a club goer tells HollywoodLife. “They were dancing and laughing and really into the music. Beyonce even got on the mic and sang Sweet Thang! She and Jay were having a genuine good time.”

Beyonce is expected to perform (and accept awards) at this Sunday’s Grammy Awards.