There's no bitterness between Britney Spears ad Lady Gaga even if the latter overthrew Spears as the most-followed celebrity on Twitter.

Spears told Pop magazine that she has no hard feelings toward the "Alejandro" singer when Lady Gaga took over her title as Twitter Queen.

Lady Gaga has over 5.7 million followers, beating Spear's 5.6 million.

"I'm a big fan of hers," she said when asked about working with Gaga. "Anything's possible!"

A collaboration between the Circus singer and Lady Gaga could still be possible. Afterall, Gaga's chart topper "Telephone" duet with Beyonce was originally offered to Britney Spears, who herself had collaborated with Madonna for the hit "Me Against the Music."

The pop star will appear on the cover of British magazine Pop September issue. Spears shot a Japanese-style cover for the magazine with art direction from Takashi Murakami.

The star's career is apparently picking up with a cameo in her "Glee" tribute episode, and a follow-up to 208' Circus on the works.