Miley Cyrus' ex-girlfriend Kaitlynn Carter is pregnant.

The Hills: New Beginnings star is expecting her first child with boyfriend Kristopher Brock.

Carter announced the news via social media on Thursday, posting a silhouette snap of her baby bump alongside her man, who is already father to six-year-old son Charlie Wright from his marriage to Brock Collection co-founder Laura Vassar.

Carter's Instagram post received positive feedback from her Hills castmates Audrina Patridge and Caroline D'Amore.

The reality TV star enjoyed a two-month fling with Miley in 2019 after the pop star split from husband Liam Hemsworth.

Carter was also previously married – to Brody Jenner. The mom-to-be has been dating Brock for 13 months.