FIRST LOOK: Lady Gaga on Gossip Girl
10/25/2009 AT 12:00 AM EDT
PEOPLE was on set while the pop star filmed her performance -- set to her new single, "Bad Romance."
“My little sister is the hugest Gossip Girl fan ever,” Gaga (with Penn Badgley and Meester) tells PEOPLE.
For more on her thoughts on the show -- and what it was like to perform in a 30 ft.-long stage dress -- check back with People.com on Nov. 16.
Gossip Girl airs Mondays (9 p.m. EST) on the CW. --Rennie Dyball
Giovanni Rufino/The CW