Prince Harry and his girlfriend Cressida Bonas let loose this weekend partying until 1 a.m. with the folk band Mumford & Sons after their gig at London's Queen Elizabeth Olympic Park.

Singer Marcus Mumford, whose Hollywood actress wife Carey Mulligan joined in the fun, reportedly invited Harry back after he went to see their show.

"Harry is a huge Mumford fan, as is Cressida," a source told UK's Mirror. "He absolutely bear-hugged Marcus. Carey was also introduced to them all. Cressida really admires Carey, too, so the girls chatted while Harry had a long talk with Marcus. They really hit it off."

Recently, Prince Harry was hanging out at Worthy Farm with the Rolling Stones, and he was apparently invited to loiter in Jay Z and Beyonce's dressing rooms at Wireless at the Olympic Park this weekend.

Harry and Cressida have been inseparable in recent weeks. Last month, they were spotted together, returning from Northumberland, where they had traveled for the wedding of Lady Melissa Percy and Thomas Van Straubenzee, the Daily Mail reports.

At the wedding, Prince Harry was a groomsman and his ex, Chelsy Davy, was maid of honor. Bonas was a guest.

Apparently there were no awkward moments. "It would have been uncharacteristic of Cressida to be intimidated by anyone at all," a friend told The Daily Mail.

"She and Harry are very fond of each other and taking things one step at a time to see whether or not there might be something more permanent one day," the source addded.

Meanwhile, Prince William and Dutchess Kate are preparing for their first child. At the moment, the given due date window is July 13-14.

Kate told reporters in Glasgow about her due date back in April: "It's around mid-July, but babies have their own agenda."

The Duke and Duchess of Cambridge do not know the gender of the baby, according to a St. James's Palace spokesperson.

As for where the child will be born, he or she will be delivered at the Lindo Wing of London's St. Mary's Hospital. This is also where the late Princess Diana gave birth to William and his younger brother, Harry.