This "Big Brother" star just got a BIG ring.

"Big Brother 15" star Aaryn Gries broke some good news on Twitter on Monday night -- she's engaged ...and we've got all the details!

The 23-year-old ranch owner tells toofab her boyfriend of six months, Nick Williams, took her jewelry shopping today in Houston. When the duo arrived at Robbins Brothers, Nick surprised her by popping the question and telling her to pick out anything she wanted.

The sparkler Aaryn went with is a whopping 1.6 carats -- and she tells us she chose it because it was what she always envisioned for herself.

Check out this Instagram video of the ring below. Wow ... just wow!

The two celebrated their engagement with dinner at the Melting Pot, telling toofab they're "very happy and excited."


Hot Videos