Lady Gaga celebrates Frank Sinatra at tribute concert in Vegas

Lady Gaga looked divine in a silver one-shoulder silver gown as she attended Sinatra 100: An All-Star Grammy Concert celebrating Frank Sinatra's 100th birthday in Las Vegas. Mother Monster sat in the audience with her father Joe and new friend Tony Bennett and watched performances by such A-listers as Celine Dion, Quincy Jones, and Carrie Underwood pay tribute to the late jazz legend.

"I loved getting all dressed like a lady for Frank tonight," Gaga told fans following her appearance at the star-studded event.

She then changed into a a black suit and took the stage herself to perform Sinatra's signature tune "New York, New York" to a standing ovation.

Sinatra 100: An All-Star Grammy Concert aired on December 6th on CBS.