Donald Faison put a ring on it ... a big one!

The "Scrubs" star popped the question to longtime girlfriend Cacee Cobb in August, and sealed the deal with a 4 carat sparkler from celebrity jewelry Jason Arasheben of Beverly Hills. Click on the "Launch Gallery" button for photos of the beautiful bling:


The oval diamond ring features pave stones and has an estimated value of $150,000. "Donald and Cacee designed the style of the ring together," sources tell TooFab. "She didn't know how big the stone would be or when she would get it! He wasted no time to propose!"

The upcoming wedding is the second for Faison, 37, and the first for Cobb, 33.

Their celebrity friends posted their congrats online. “Congrats to @donald_faison and @caceecobb on their engagement,” Faison's longtime costar Zach Braff tweeted. “Just wish I was there to run around you both with sparklers.”

Jessica Simpson, Cacee’s close friend and former boss, added, “Congrats @caceecobb! I love u and ur man!”

No wedding date has been announced. "I love how once you're engaged the only thing people ask is 'have u set a date?' I don't know the first thing about planning a wedding," the bride-to-be tweeted.

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