This Father's Day was an extra-special one for "Bachelor" alum Kacie Boguskie Gaston and husband Rusty Gaston. She announced on Sunday that she's pregnant and the couple is expecting their first child, Us Weekly reports.

The former reality star took to Instagram on Sunday to post a photo of herself and Rusty, each with a hand on her growing baby bump. "Happy Fathers Day to @rustygaston! The best husband and soon to be DAD!! I can't wait to raise our little guy together! #september2015 #rustyandkacie #babygaston #babybumpin #27weeks," the caption reads.

Kacie appeared on two seasons of ABC's "The Bachelor," where she fought for the hearts of Ben Flajnik and Sean Lowe, People reports. She announced her engagement to music producer Rusty in Februrary 2014 on Instagram. The Nashville, Tenn., couple were married three months later and celebrated their one-year anniversary in May.

In her recent Instagram announcement, Kacie tells fans she is currently 27 weeks pregnant and expecting a baby boy due in September. She reached out exclusively to E! News to share her excitement.

"I'm so happy with where I am in life. I wouldn't want to be anyplace else," she told E! News. "I feel great! It's been pretty easy so far, I feel pretty good."