Rob Kardashian Wishes Blac Chyna a Happy Birthday on Instagram After Skipping Her Party

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The reality star's on-again, off-again fiancee turned 29 on Thursday.

Rob Kardashian is wishing "pretty mama" Blac Chyna a happy birthday.

The 30-year-old reality star took to Instagram on Thursday to send his on-again, off-again fiancee his best wishes after skipping out on her birthday party the night before.

RELATED: Blac Chyna Rings in 29th Birthday With Family and Friends, No Sign of Rob Kardashian

"Happy birthday @blacchyna ??," Kardashian wrote alongside a throwback photo of himself and Chyna at Legoland, captioning another pic, "Happy birthday pretty mama @blacchyna."

RELATED: Dream Kardashian Sits Up By Herself in Adorable Snapchats From Mom Blac Chyna

On a recent episode of Keeping Up With the Kardashians, Rob's sister, Kim Kardashian West, opened up about his future with Chyna, revealing that she thought "they're just not meant to be with each other."

"I've always felt like them as a couple is just not that healthy, and I think they know it too," she said. "It's not just like some secret."

See more in the video below.