Michelle Aguilar: Engaged to Matthew Whitehead!

Michelle Aguilar won the most recent season of The Biggest Loser.

But that wasn't the best thing to happen to this reality TV star over the last couple months:

Nine days after she was declared champion, Aguilar's boyfriend of four months, Matthew Whitehead, proposed.

"I was so shocked!" Michelle told Us Weekly.

The 27-year-old Aguilar - who lost an 110 lbs. during the series - is relieved that shopping for a wedding dress will be "absolutely liberating."

"Before, you have that fear: 'Hey, can you pull me a size 20?'" said Aguilar, who is now a size 4 to 6. "What girl wants to say that?"