Trace Cyrus and Brenda Song Engaged!

Miley's brother confirms he's popped the question to his Disney star girlfriend of more than a year, but no word yet on a date for the presumably expecting couple

Miley Cyrus is gaining a sister-in-law!

That's right, they may not be confirming anything else, but they are confirming this: Trace Cyrus and Brenda Song are engaged!

The couple, who began dating in spring 2010 and who, at least at last check, are expecting their first child together, revealed the happy news on (where else?) Twitter this afternoon.

"I am very excited to say, last week I asked my girlfriend Brenda Song to marry me and she said YES! We are both very excited to be engaged!" the 22-year-old fiancé announced.

There's still been no official word from Song—not that one is really needed—but it was the 23-year-old Disney star herself who sparked speculation of her marital status this morning, when photos emerged of her wearing what appeared (and has since been proven) to be an engagement ring.

All we can say is—dang! Who knew being the former frontman of Metro Station paid so well?

"@TraceCyrus can't wait for Brenda to be a Cyrus :) couldn't be more excited about my 'sister in law to be' yay :)," a supportive Miley Cyrus tweeted to her bro.

No wedding date has yet been announced for the couple, which makes two unknowns for the young duo.

Though a source confirmed to E! News back in August that Brenda was pregnant, last month her mother Mai Song reportedly (grain of salt alert) spoke to Star, and adamantly declared that her daughter is "actually not pregnant."

For her part, Song has taken pains to maintain a low profile (save for today's bling-baring excursion), and when she has appeared in public, it's always been under the protection of some pretty baggy clothes. So the mystery, at least for now, continues.

In any case, congrats, you two! Life for the Suite Life of Zack & Cody star has never been so suite sweet.