Britney Spears has flown home after celebrating her engagement in Las Vegas on Friday (16.12.11).

The 'Hold It Against Me' hitmaker was spotted leaving her private jet at a Los Angeles airport yesterday (18.12.11) as she and fiance Jason Trawick arrived back after toasting their happy news and his 40th birthday over the weekend.

The pair were joined by Britney's sons Sean Preston and Jayden James as they got off the plane and headed for a waiting car.

Britney and Jason partied in the Chateau club in Vegas, spending money on Dom Perignon champagne and a chocolate fountain to celebrate their engagement.

The blonde beauty took to her twitter account to describe it as a "magical night" and praise her new fiance.

She tweeted: "Tonight was one of the most magical nights of my life. Such an amazing time with my new fiance and our closest friends and family. Blessed. (sic)"