Britney Spears celebrated turning 30 with a belated birthday bash on Friday night (09Dec11).

The pop superstar reached the milestone on 2 December (11), but shunned a lavish celebration and instead spent the day ice-skating with her boyfriend Jason Trawick.

She finally hosted a belated birthday party on Friday to celebrate her big day and the end of her Femme Fatale tour, which came to a close in Puerto Rico on Saturday (10Dec11).

Spears took to her Twitter.com page to post a picture of herself blowing out candles on a massive birthday cake with the caption, "Having an amazing time at my end of tour / belated bday party!"