LOS ANGELES, California (X17online) - Britney Spears gave a preview performance of her upcoming "Circus" Tour for a select group of family and friend in New Orleans over the weekend.

In the audience of about 30 or so were Spears' mother, Lynn, her father, Jamie, sister Jamie-Lynn with daughter Maddie, and sons, Sean Preston and Jayden.

Although a source at the show says Brit was way nervous before going on, "she got such positive feedback that she’s a lot more confident about her performance."

According to tour insiders, Britney may be joined by a surprise guest for the tour's opening night. “The rumor going around is that Madonna is going to join Brit onstage for at least two tour dates,” a source tells the New York Daily News. “And that would be totally fierce.”