Danica McKellar is engaged to boyfriend Scott Sveslosky!

The 'Wonder Years' actress and 'Dancing With the Stars' alum revealed the thrilling news on Instagram yesterday, July 16, posting a snap of herself grinning from ear-to-ear and pointing out the new-found bling on her left ring finger.

"So...can you guess what my big news is??" she captioned the photo. And just in case it wasn't obvious, McKellar was quick to make the official announcement via Twitter:

In addition to her roles as Winnie Cooper, a 'DWTS' alum and mom to 3-year-old Draco (from her previous marriage to Mike Verta), McKellar is also a seriously brilliant mathematician who earned her Ph.D. and wrote a book on math.

The former child actress also thrilled 'Wonder Years' fans recently when she got together with the rest of the cast and posted some seriously adorable (and nostalgia-inducing) selfies with the Arnold family. So cute!

Congratulations to the happy couple! Check out Danica McKellar's super sweet engagement selfie in the picture above.

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