Britney Spears showed off her engagement ring at Jason Trawick’s birthday party in Las Vegas

Britney Spears took her Twitter page earlier in the day to tell fans she was “still glowing” after boyfriend Jason Trawick proposed her on his 40th birthday.

Last night, Britney Spears, 30, looked more radiant than before as she showed off her engagement ring while hosting a party for her former agent beau to celebrate both their engagement and his birthday.

Britney Spears donned her sparkling three carat Neil Lane diamond with pride as she posed up with her new fiancé at the Planet Hollywood Resort and Casino in Las Vegas.

Earlier in the day, Britney tweeted fans: “Still glowing! About to jump on a plane to Planet Hollywood in Vegas.

“Throwing a Bday Party for Jason at Chateau Night Club. So fun. Xxoo”

Britney Spears and Jason Trawick will be celebrating their engagement with a private gathering at the resort, before moving on to a celebratory dinner at the Chocolate Lounge at the Sugar Factory in the Paris Hotel before carrying on the festivities at a dance party at the Chateau nightclub.

They looked happy and excited as they made their way into the resort for the party, Britney Spears beaming as she was congratulated by staff and fans.

Las Vegas is a familiar territory for Britney Spears – it is where her 55 hour marriage to first husband Jason Alexander began and ended.

Jason Trawick asked for Britney Spears’ hand in marriage in Los Angeles yesterday on his 40th birthday.

“Yes, we are engaged,” Jason Trawick told Access Hollywood today.

Talking about the Neil Lane ring, an insider told Us Weekly: “He picked out something he knew she would love.”

“He surprised her after she gave him his gifts and after they had cake last night,” another source adds.

Britney Spears, who has just wrapped her Femme Fatale tour, hinted at the news this morning on her Twitter page.