Prince Harry and Cressida Bonas reportedly enjoyed an evening at the movies Tuesday, fueling speculation that they are rekindling their relationship.
The couple, who split in April, headed out to a cinema near Kensington Palace to see the comedy Sex Tape, starring Cameron Diaz and Jason Segel, according to the Sun newspaper.
After the film, Harry, who turned 30 on Monday, jumped into a car with his police protection officers while Cressida took a cab.
"They tried hard to blend in. None of the other cinemagoers seemed to realize," an onlooker told the paper.
On Sunday, the actress and ex-dance student, 25, attended the concert finale of Harry's brainchild, the Invictus Games. Sipping from a plastic bottle of cider, she waved her arms enthusiastically to rock band the Kaiser Chiefs as she partied with friends, including Harry's cousin Princess Eugenie.
When Harry and Cressida parted in the spring, a royal source told PEOPLE they were still the "best of friends." Since then, Bonas has landed her first film role, while Harry worked on the Invictus Games and enjoyed a summer of fun at low-key rock festivals and parties in Sotogrande with his cousins Beatrice and Eugenie.
It remains to be seen if Bonas is back in Harry's romantic life for good. An insider tells PEOPLE of their breakup, "They were really in love with each other, and it was a painful decision to part. Their relationship wasn't working out."
The source suggests it was "stifling" her and "she may have felt she wasn't her own person."