AceShowbiz -

Lady GaGa apparently is in the holiday spirit. The singer who is known for her unique outfit wore a pine tree as a hat as she left the "Jingle Bell Ball" show at O2 arena in London on Sunday evening, December 8.

The tree GaGa wore during the evening was completed with some baubles and a golden star on top. In addition to the tree hat, the "Applause" singer wore green wig, making her appearance similar to a Christmas tree. She additionally wore a red dress and towering boots as she walked to the Langham Hotel.

On Sunday, GaGa performed at the 2013 Capital FM Jingle Bell Ball. During her performance, the 27-year-old singer told the audience that she was so happy to be able to go back onstage. "This is a very exciting day for me. I haven't performed in an arena since February because grandma had a hip problem. So thank you for being my welcome back," she said, as quoted by U.K.'s Daily Mail. "I have a very very rebellious spirit but when I get in trouble I tell them I was born this way," GaGa added between songs.

"I learned something really special during all my time off. While I was gone, I learned I might have had my picture taken every day and people calling my name but I felt unfulfilled. I never wanted to be famous for no reason. I live for this moment when the spotlight hits my face. I get to watch you laugh at me and say I can't believe she said that. I want you to know that. I want you to know, I don't live for fame I live for this moment right now, the applause," she also said.