Kaitlynn Carteris marking her newest age milestone alongside rumored girlfriendMiley Cyrus.

The pair were dressed to the nines on Wednesday evening to celebrate Carter’s 31st birthday, shown in a series of black-and-white shotson her Instagram Story.

For the occasion, Carter wore a long-sleeved, black mini dress and black high heels as she cozied up next to the smiling singer in the photos. Miley, 26, opted for a long-sleeved, white button-down shirt and black slacks.

Subsequent videos saw the birthday gal seated at a table in front of a big ice-cream sundae,complete with a candle, as the gathered group (including Miley, who was seated next to her) sang “Happy Birthday.”

Kaitlynn Carter/ Instagram

Kaitlynn and Miley Cyrus

Kaitlynn and Miley Cyrus

Kaitlynn and Miley Cyrus

Miley’s older sisterBrandi Cyrusgot in on the birthday love too,sending Carter well wisheswith a photo she shared on herInstagram StoryWednesday.

The European getaway was the first time Miley andThe Hills: New Beginningsstar — who recently split from husbandBrody Jenner— were snappedkissing following the newsthat the “Wrecking Ball” singer and her ex,Liam Hemsworth, haddecided to call it quits.

Hemsworth, 29,filed for divorce on Aug. 21, citing “irreconcilable differences.” The pair signed a prenuptial agreement ahead of their marriage, so a smooth divorce is expected, PEOPLE confirmed.

DIGGZY/SplashNews.com

Miley Cyrus,Kaitlynn Carter

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They were also spotted on an L.A. lunch date Sunday with Miley’s mom,Tish Cyrus. In photographs of the outing, Miley wrapped her arm around Carter’s shoulder as both women smiled, wearing matching white T-shirts.

“They live together and are very happy,” a Mileysource told PEOPLE at the time. “Miley is doing great. She is moving on. She seems to have no regrets. She loves being with Kaitlynn.”

source: people.com