Could Prince Harry be reigniting his old flame with ex-girlfriend Cressida Bonas? The British royal was spotted celebrating his 31st birthday Tuesday night at a London pub with a large group of friends, which included his former love interest. Their reunion left many wondering if there may be a potential romance brewing -- again.

According to People magazine, Prince Harry and his pals partied it up into the wee hours of Wednesday morning. Sources told the publication he invited Bonas, 26, because, although they broke up in April 2014, they are still close friends. The pair reportedly spend a lot of time catching up and are "part of the same group of friends." The source insisted, however, that there is nothing romantic going on between the Prince or Bonas. 

"She was invited along to a birthday party with the big group of people and that was it," the source said. "They're friends."

Reports of his reunion with Bonas come just on the coattails of stories claiming that Prince Harry and his former girlfriend Chelsy Davy had gotten back together. Us Weekly reported Tuesday that after breaking up for good in 2011, the prince and Davy decided to give their love another go. Sources claiming to be close to Harry told the publication the estranged lovers "still have strong feelings for each other."

Prior to his pub-party, Prince Harry spent his birthday at Goodwood Aerodrome in Chichester, West Essex, England. As we reported, he intended to fly one of the many Spitfire, Hurricane and Blenheim planes at the site in honor of veterans and wounded servicemen. Unfortunately, due to inclement weather, he was unable to do so. Instead, the prince offered his spot in one of the planes to Tom Neil, a 95-year-old who is the "last living Royal Air Force ace." Kensington Palace's Twitter account later posted a photo of Prince Harry and Neil together that day.