Robert Pattinson is reportedly inviting longtime pal Katy Perry to his wedding to FKA twigs, but some are wondering if ex-girlfriend Kristen Stewart will also get an invitation.

According to HollywoodLife.com, the pop star is on the guest list for the upcoming ceremony, and she will supposedly have a big part in the couple's special day.

"Katy absolutely adores Tahliah and is so happy for Rob," a source claimed. "She's never seen him happier."

Also, Pattinson is supposedly considering inviting Stewart to his wedding, since the former couple and "Twilight" co-stars "shared so much of their lives together," especially rising to fame together.

Another source insisted, via HollywoodLife.com, that the British actor holds no grudges against his ex-lover for cheating on him with her "Snow White and the Huntsman" director Rupert Sanders.

"For Rob now, there's no bad blood," the source said. "He's moved on, and so has Kristen. It is time to look forward to the future."

Meanwhile, Pattinson and FKA, who want to keep it casual and not be in the limelight, will most likely get married in England, where their families and close friends reside.

"Rob misses England," an insider told OK! Magazine. "They both love nothing more than to have a few drinks in a country pub. They're even house hunting there. An over-the-top LA ceremony is the last thing either of them wants."

The pair has supposedly discussed walking down the aisle during the summer as a possible time frame. However, the wedding will be postponed until the end of the year. "The Rover" actor is set to star on "The Walking Dead" and the "Pendulum" crooner will be touring until August.

"They're both having fun coming up with ideas," the insider added. "They'll try to keep it secret -- and will definitely keep T-Pain out of the loop!"