It was a party in the USA for Kaitlynn Carter's birthday. 

On Wednesday, the Hills reality star rang in her 31st birthday with famous company: Miley Cyrus. Over on Instagram, Carter shared a few black and white snaps of them posing together, the birthday gal donning a square-neck dress and heels while the songstress opted for a button-down and pants for the occasion. 

In the photos, the women are on a balcony overlooking a valley of houses while alternating between serious and smiles. 

In addition to the photo shoot, Carter also shared clips from the celebration on her Instagram Story, including footage of her blowing out the candle on her birthday dessert while Cyrus sat nearby documenting the moment. 

According to a source, Cyrus planned the dinner for Carter and three friends at Sunset Tower. "Sunset Tower is one of Kaitlynn's favorites, and Miley wanted it to be special and all attention on her," the source said. 

At the end of the meal, a custom sundae, said to be Carter's favorite, was brought out and the table sang "Happy Birthday," the source described. 

The two spent a lot of time together for the special occasion. "Miley and Kaitlynn had drinks together at the bar before and after their dinner, and it was very intimate. It was just the two of them for a while and they wanted to cherish their time together alone. They were both in a great mood all day and Kaitlynn seemed to be excited about spending the day and night with Miley," the source told E! News. "Before the dinner, Miley and Kaitlynn spent the day relaxing at Miley's home outside by the pool and ran errands. Kaitlynn is now basically living in Miley's home. She has her own apartment in West Hollywood, but has not spent a night there in months. She hasn't officially 'moved in' to Miley's, but it feels like her home and she spends the most time there."

While the Grammy nominee did not share any birthday wishes for the guest of honor, the two have been popping up everywhere together since splitting from their significant others, Liam Hemsworth and Brody Jenner. After holding hands while arriving to an MTV Video Music Awards after-party in late August, they were together over Labor Day weekend getting lunch with Cyrus' mom, Tish Cyrus

Kaitlynn Carter, Miley Cyrus

Instagram

"Miley and Kaitlynn have been inseparable for almost two months, and it's no surprise that Miley asked Kaitlynn to go to the VMAs," an insider previously told E! News. "Kaitlynn has been a huge support system for Miley, and they haven't left each other's sides in almost six weeks. They are basically living together at this point, and their relationship is getting more serious."

Nothing says more serious like celebrating a birthday together! 

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