Alyson Hannigan is glowing—partially due to that new sparkler on her finger.

The How I Met Your Mother star showed off her new rock, along with a super-cute excited face, earlier today, after sharing with her Twitter followers that she and hubby Alexis Denisof will be renewing their vows for their 10-year anniversary.

"My hubby @ AlexisDenisof surprised me with the most romantic day of my life yesterday! Which included another proposal & ring! I said YES!" Hannigan tweeted.