Details of the engagement party of Britney Spears and Jason Trawick!

Britney Spears had a lovely evening of celebration on Friday (16) to celebrate her engagement to Jason Trawick, according to account exclusively to People magazine.

After arriving in Las Vegas, the couple went to Planet Hollywood, where he stayed in a suite of 3,100 square meters, designed by designer Jonathan Adler. Nicknamed 'suite mega', the two-bedroom home overlooking the Eiffel Tower Restaurant at Paris Las Vegas Hotel and the famous fountains 'dance' at the Bellagio [where Britney appeared in 2001 with the hit I'm A Slave 4 U]. The suite also has a striking red Murano chandelier in the entrance, and a full dining room, living room and Jacuzzi tub.

Spears, wearing a short dress signed by French designer Herve Leger, left a few hours later and revealed its long awaited ring designed by Neil Lane during a welcome reception on the mezzanine of the hotel. The founder and president of Planet Hollywood, Robert Earl, Jason presented with a huge birthday cake in a quick ceremony.

"She wanted it to be something quick because her children were upstairs and she wanted to put them to sleep before leaving for the party", a source told People.

After the celebration, the couple made a stop in the lounge of the Sugar Factory, where they ate a turkey burger and a club sandwich in a room closed to the public, to provide privacy to the couple. Then waiters who served the couple took a tray of cupcakes and a huge sundae for dessert covered with granules.

The newlyweds ended the night at the Chateau Nightclub. Surrounded by friends, Spears, 30, and Trawick, 40, enjoyed the ballad in its own VIP table overlooking the track and dance.

"Britney looked so happy holding hands with Jason", said a source at the party. The couple went to a private area after 1 am, but Spears continued dancing full tilt until almost 4am.

"Tonight was one of the most magical of my life. A wonderful time with my fiance and our closest friends and family. I feel blessed!", Said Britney via Facebook early on Saturday during the party.

To review the pictures from the party in Las Vegas, click here. Below videos of the celebrations: