Kim Kardashian West's baby bump has officially popped! The reality star shared a sweet photo on Instagram of her growing baby bump and showed off her chic maternity style, Us Weekly reported.

"Good night baby," she captioned her mirror selfie. She posed with her left hand cradled gently underneath her belly, flashing her diamond wedding ring. She blew a kiss in the mirror to her unborn son.

Kardashian showed off her chic maternity style in the photo with a white fitted, knee-length dress. The curve-hugging outfit fit perfectly snug around her growing baby bump. She completed the sophisticated look with a long-sleeve peach knee-length Margiela coat and a pair of nude strappy Manolo Blahnik sandals.

The 34-year-old and hubby Kanye West are already parents to 2-year-old North West. The couple is expecting their baby boy in December, according to People.

The "Keeping Up With The Kardashians" star opened up recently to Entertainment Tonight about her flawless maternity style and said she's learned a lot about what worked and what didn't work from her first pregnancy.

"I think you can really figure it out the second time more so than the first time. I didn't get the body changes but now I do," Kardashian told Entertainment Tonight. "I want to wear things that make me feel good about myself and still feel sexy and just because you're pregnant doesn't mean you can't wear heels and you have to wear sweats all day long."

See her sweet goodnight snap below.

 Good night baby

A photo posted by Kim Kardashian West (@kimkardashian) on Jul 27, 2015 at 9:49pm PDT