Original Beverly Hills 90210 star Ian Ziering is ready to tie the knot a second time. He's engaged to his girlfriend of just four months, Erin Kristine Ludwig!

Steve Sanders slyly changed his Facebook status from "in a relationship" to "engaged" last week. Thought you could fly under the radar? Think again Ian!

Ziering followed up the low-key announcement by relaying some of the finer points of his courtship, identifying the lucky lady as Erin Ludwig. She's cute!

Here's a photo of the soon-to-be-married pair:

"She's a nurse, we're planning a spring wedding and we've been together since Labor Day '09," he said, and while that's a fast courtship, sometimes you just know.

Especially when you're Ian Ziering. How many more shots do you have?

Congratulations to the happy couple!