12/05/2008 AT 10:20 AM EST
Topping off a celebratory week that included her 27th birthday
and the debut
of her new CD Circus
, Britney Spears
was the surprise guest who lit the tree at Thursday's launch of L.A. Live! for the premiere performance of Light of the Angels
at the Nokia Theater. Sharing the Christmas spirit with her were sons Jayden and Preston and father Jamie – as well as host Adam Carolla and Los Angeles Mayor Antonio Villaraigosa. Asked about her favorite holiday traditions, the pop star said being with family and decorating the tree.
– Reporting by Rae Pardini
The L.A. Tree!
AXELLE / BAUER-GRIFFIN
2000: Brit counts Prince William as a fan
Best of 2008: How Britney turned her year around