Karwai Tang/Wireimage
Simon Perry
September 17, 2015 10:45 AM

Prince Harry likes to keep his friends close – and his exes closer.

The royal celebrated his 31st birthday until the early-morning hours of Wednesday at a London pub with a large group of pals – including his ex-girlfriend, actress Cressida Bonas.

A source close to him says the prince and Bonas, 26, have remained tight and frequently catch up with each other.

They are “part of the same group of friends,” the source tells PEOPLE.

“She was invited along to a birthday party with the big group of people and that was it,” the source adds of the bash, which was held in a private room at the Cross Keys pub in Chelsea. “They’re friends.”

The party broke up at about 1:30 a.m. on Wednesday – and Bonas didn’t go back to the palace with Harry, a source confirms.

Not in attendance was another ex, Zimbabwean attorney Chelsy Davy, whom Harry reportedly caught up with in Africa during his three-month tour working on conservation projects.

Prince Harry and Chelsy Davy in 2007
JEWEL SAMAD/AFP/Getty

While he is clearly keeping close to his exes, the source tells PEOPLE he doesn’t have anyone special in his life at the moment. (Cue the confetti.)

At the late-night pub party, Bonas joined some of Harry’s closest pals, including Guy Pelly and his American-born wife Lizzie, Charlie van Straubenzee and Tom “Skippy” Inskip. Also there was his cousin Zara Phillips and her husband Mike Tindall.

Harry – who spent most of his birthday commemorating the sacrifice and service of the pilots of WWII – and Bonas broke up in April last year. But they stayed close: She was at the closing ceremony at Harry’s Invictus Games on the eve of his 30th birthday last September, and she was also spotted with him on a movie date later in the same week.

Meanwhile, he quietly supported her by watching her perform on the London stage.

Bonas, who spent some of the summer with fellow actor Edward Holcroft, arrived with a friend to the pub, which is owned by Mark Dyer, an old pal of Harry and his brother Prince William.

Ingrid Seward, editor-in-chief of Majesty magazine and author of The Queen’s Speech, says of the blue-blooded Bonas, “They are close friends. And Cressy’s not the sort of girl you would fall out with. I wouldn’t read anything much into it at this stage.”

One of the key reasons behind Harry’s split from both Bonas and Davy was the glare of the royal spotlight – and that hasn’t changed.

“Why would they want to go back into that?” says Seward. “Both of those girls felt the same thing. He will always be friends of Cressida and ditto Chelsy.”

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