It’s birthday cake time for Britney Spears! The pop star celebrated her thirty-first birthday on Sunday (December 2).

The “Toxic” singer received birthday greetings from friend, and fellow “X-Factor” judge, Khloe Kardashian via MTV News. “Happy Birthday pop princess Britney Spears. I think you’re phenomenal and amazing and I wish you many, many more.”

The year has been filled with personal and professional highs for the once-troubled star. Spears signed on as a judge for ” The X-Factor,” and got engaged to longtime boyfriend, Jason Trawick.

On the music front, Britney recently released the video for her track “Scream and Shout” with It is already at the top spot on the iTunes singles chart.

You can check out Khloe’s birthday wishes for yourself below.