Diddy's Ex Cassie Is Engaged to Bull Riding Baby Daddy, Alex Fine!

Cassie is engaged!

The pregnant star said "Yes" to fitness trainer and bull rider Alex Fine's proposal on her 33rd birthday Monday evening.

The Proposal:

The proposal went down at the famous horse ranch Compton Cowboys.

Cassie shared the romantic moment in a video on Instagram hours after it went down. "My favorite day ever!" she captioned the clip and added the hashtag, "Mrs. Fine."

Get some tissues because the whole thing is pretty sweet.

In the video, Fine is seen getting into his cowboy garb ahead of the big moment.

Much like a wedding, Cassie, who is pregnant with their child, is being escorted to the wooden archway that has their initials in big letters.

Her reaction is captured perfectly. She's seen smiling big as she gets closer to her baby daddy.

As Fine drops down to one knee and opens the box to unveil the ring, Cassie took no time to think.

She immediately covered her mouth with excitement and jumped into Fine's arms as horses road wildly in the background.

The fitness professional couldn't be more happy with the outcome and shared his sincere happiness on social media.

"This moment will always be so special to me," wrote Fine. "I get to marry my best friend in the whole world. How am I so lucky?"

He also took time out to thank the men who helped him pull the proposal off.

Posing with his buddies at Compton Cowboys, he wrote, "Thank you for helping me plan the proposal I Needed my family to be apart of it to make this day the most special."

Cassie + Alex:

Cassie and Fine have been linked since last December, not long after she split with her longtime boyfriend Diddy.

She's now expecting her first child -- a daughter -- with the celebrity fitness trainer and made the announcement in June.

It's nothing but love for Cassie and Diddy though. He even wished her congratulations on the pregnancy.

Congrats to the happy couple!