Some birthday presents really are the icing on the cake.

'True Beauty' host Vanessa Minnillo touched down for a Mexican vacation on Nov. 5 flashing a little pre-30th birthday bling: her new engagement ring from Nick Lachey.

The lovebird Scorpios, who share the same Nov. 9 birthday and have been dating since 2006, announced their engagement via Lachey's Twitter account.

"If anyone's heard the rumors of my engagement they are absolutely true," the singer, who turns 37 next week, tweeted. "Vanessa and I couldn't be happier. Thanks for all the love."

The ring appears to be a whopper -- a platinum-set, Asscher-cut diamond with trapezoids on the side from designer Bader & Garrin, according to Us Weekly.

A source tells the mag Minnillo was very happy with the ice: "It's big and beautiful. She loves it."