The `Criminal` hitmaker`s boyfriend Jason Trawick was expected to propose tonight on 16.12.11 but surprised her by doing it last night, and will celebrate her saying yes by throwing a huge party at the Chocolate Lounge and Sugar Factory in the Paris Hotel in Las Vegas.
Britney wrote on twitter: "OMG. Last night Jason surprised me with the one gift I`ve been waiting for. Can`t wait to show you! SO SO SO excited!!!! Xxo(sic)"
At the party will be a giant chocolate fondue fountain and chocolate truffle cigars, before they will head off to the Chateau nightclub, TMZ.com reports.
Jason - who has been dating Britney for two years - asked permission from her father Jamie before getting down and one knee.
The singer, who has been married twice before, will need to get a judge to formally sign off the marriage as she continues to be under the conservatorship of her father after a public breakdown more than three years ago.
A source said previously: "When Britney does get engaged, her father`s attorneys will notify the judge in her conservatorship case. It`s extremely within the realm of possibility that the conservatorship will end, and then Britney will get married. It will be a very smooth transition."