Engagement Ring by Britney Spears

Now that it's official, thanks to Spears' Facebook announcement -- we've got all the details on Britney Spears engagement ring from Jason Trawick.

The ring was designed by Neil Lane and Trawick apparently had a big hand in ensuring the custom creation was perfect, reports People.com. The ring has a tiara-motif and "looks like a mini crown," Lane says. It features a perfect round white diamond in a platinum setting with 90 small diamonds that stretch around the eternity band. "Jason didn't want an over-the-top ring with a giant stone," says Lane. (Take that, Kim.) And let's be honest, the ring is pretty tasteful, as far as celeb engagement rings go these days. We're impressed.

Lane also adds that when it finally came time to pick up the ring -- and thus, nearly time to pop the question -- Trawick was just as nervous as any other guy might be. "[He] was so excited and nervous. At the end of the day, even with all the fame, he's still a normal guy who was about to propose to the woman he loves," Lane tells People.com.

After popping the question, the couple jetted off to Las Vegas to celebrate their engagement -- and Trawick's 40th birthday, reports E! Online. The two lovebirds were spotted kissing and canoodling all night as they dinned first on salmon and pizzas, before celebrating with a birthday dessert of gumdrops, cupcake and an awesome red velvet cake. Spears tweeted late in the evening that it was "one of the most magical nights of [her] life."

No word yet on the wedding date, but we're betting it will be spectacular.

Images via E! Online and People.com.