Cressida Bonas Prince Harry's rumored girlfriend, Cressida Bonas, at the closing ceremony for the Invictus Games at the Olympic Park in London, Sept. 14, 2014. Photo: Reuters

Britain’s Prince Harry celebrated his 30th birthday this week by reuniting with his former girlfriend Cressida Bonas. Just four months after calling their relationship of two years quits, multiple reports claim that Prince Harry and Bonas, 25, have reconciled.

Following Bonas’ appearance Sunday at London’s Invictus Games, an event organized by the British royal, the Sun (via the Telegraph) reports that Bonas visited Harry at Kensington Palace on Monday in honor of his birthday. The following night, the duo reportedly accompanied one another on a secret theater date.

Hello Magazine reports that the rumored couple were seen catching a screening of Cameron Diaz and Jason Segel’s comedy film “Sex Tape” at Odeon theater in Kensington, Tuesday. “They seemed very happy together when they went into the cinema,” a source said. The eyewitness claims that the duo left the theater separately after realizing they had been spotted. “It was apparent they did not want to be photographed together,” said the source. Despite publicly parting ways, onlookers say Bonas’ taxi was seen heading toward Kensington Palace after their date.

Prince Harry and Cressida Bonas Britain's Prince Harry (R) and Cressida Bonas (2nd R) watch the WE Day UK event at Wembley Arena in London March 7, 2014. Photo: Reuters

During her split from Harry, Bonas remained close to the royal family. Not only did the aspiring stage actress attend the closing ceremony for the Invictus Games at the Olympic Park in London Sunday with her pal and royal cousin Princess Eugenie, she has also been seen out and about with the prince's close friend Guy Pelly.

The couple amicably parted ways this past spring over Bonas’ allegedly “needy” behavior, People magazine reports. “It just wasn’t working out,” said a source. “They are very much still the best of friends, but they have decided to go their separate ways.”

Other reports indicate that Prince Harry’s sister-in-law, Duchess of Cambridge Kate Middleton, may have played a hand in the breakup after giving Bonas tips on marrying into the monarchy. “Cressida has spoken with Kate about the expectations that come with being part of the royal family,” an insider told Star magazine. “Kate’s been honest about her struggles, and it’s been a lot for Cressida to process.”