Britney Spears threw a DJ-themed skate party for her sons at the weekend.

The 'Piece of Me' hitmaker had time off from her Las Vegas residency to treat sons Jayden, nine, and Sean Preston, 10, to a joint birthday celebration complete with a trip to an indoor skate park.

Captioning photographs of their special day, she wrote on Instagram: ''Happy bday to my boys - love you Jayden & Preston!

''Thx @skatelab & #lindacohencakepops for making the day so special. (sic)''

The group of around 40 guests - including the 33-year-old singer's ex-husband Kevin Federline, the boys' father - enjoyed the treat of a ''party zone'' at the skate park, a special room made available exclusively for them but still enjoyed what the entire venue had to offer.

A source said: ''They were cruising around and didn't just stay in the private room. Everyone had a blast.''

And Linda Cohen, who personally designed the boys' cake and the other treats on offer, revealed the star was ''super sweet'', greeting all the boys' guests.

She added to E! News: ''Britney's boys are total skater boys. While last year's party was totally skate-themed, this year the boys wanted a little bit of a DJ-theme incorporated ...

''Words cannot describe how unbelievably thrilling it was to be able to help them create a fun and awesome skate party. As expected, [Britney] was super sweet and greeted all of her guests with a wide smile and a phenomenal hospitality.''