Lady GaGa struggling to write new album 'ARTPOP' after surgery?

Lady GaGa is reportedly struggling to work on her third studio album after having hip surgery last month.

The singer was forced to cancel her 'Born This Way Ball' tour after requiring immediate medical attention, but has now allegedly encountered a "creative block" while working on her third collection ARTPOP.

Lady Gaga carries a puppy as she leaves her hotel in Sofia where she is for the first gig of her European tour Sofia, Bulgaria

"She keeps telling friends she has terrible creative block and can't make any new music right now," a source told the National Enquirer.

"She is under huge pressure to keep making money for [her record label] and she desperately misses her boyfriend Taylor Kinney, who lives in Chicago. It's just messing with her confidence. She's a wreck!"

Lady GaGa's new album ARTPOP was originally earmarked for a spring 2013 release, but it is expected this date has been pushed back.

Meanwhile, the star was recently spotted using a 24 carat gold-plated wheelchair while she recovers.

Watch the music video for Lady GaGa's 'Edge Of Glory' below: