The party that began last weekend on Saturday Night Live with Madonna and Lady Gaga didn't end on TV.

In fact, in continued into the wee hours of the morning

Following their surprise dance-off on SNL, Madonna and Lady Gaga decided to "just dance" for real and hit a NYC club together at a birthday party for Madonna's manager, Guy Oseary.

New York gossip column PageSix reported that the club's DJ continued to alternate between songs "Holiday" and "Poker Face." Eventually Madonna and Lady Gaga gave their fellow clubbers exactly what they wanted - a legitimate dance off.

No word on who won... or if Madonna ever found out what a "disco stick" is.

But having displayed her acting chops to great reviews on Saturday Night Live, Lady Gaga is bound for the small screen once more; this time for an appearance on the CW network’s "Gossip Girl."

Lady Gaga joins the ranks of Tyra Banks and Hilary Duff who have also made recent high-profile cameos on "Gossip Girl."