NEW YORK: Beyonce is set for another major musical collaboration - she's working on a secret project with Lady Gaga. After teaming up with Shakira and husband Jay-Z on record and Tina Turner and Prince onstage, the Single Ladies star is set to test her fanbase with a GaGa diva duet on her upcoming single Video Phone. The pop stars were spotted shooting a video for the song in a New York studio together last week (07Oct09) and all those involved in the secret get together were instructed to keep details under wraps. But one insider tells Life & Style magazine, "Everything on the set was being kept very hush-hush, and security was extremely tight. "In the video, Beyonce wears a feathered dress. And of course Lady GaGa wears something wild. The fashion is sick and insane."