Michael Phelps Engaged to Former Miss Calif.

Michael Phelps has taken the plunge and gotten engaged. The 18-time Olympic gold medalist announced on Twitter he's marrying Nicole Johnson, who was Miss California in 2010 (after the Golden State gave the world Carrie Prejean) and has dated Phelps on and off the past few years. Phelps tweeted early today: "She said yes" beneath a photo of the couple, hugging in the snow, taken by teammate Allison Schmitt. Phelps' sister, Hilary, wrote on Facebook, "CONGRATULATIONS to these two lovebirds on their engagement! Couldn't be happier for my brother and thrilled to gain a sister, who I adore and love already!"

The engagement comes as Phelps is serving a six-month suspension from USA Swimming for his second drunken-driving arrest. The suspension ends March 6, and Phelps is expected to return to competition in April. (More Michael Phelps stories.)