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2 September 2013, 11:27 | Updated: 2 September 2013, 13:00
The 'Rolling In The Deep' star made a rare public appearance at London show last night.
Adele and One Direction star Niall Horan were among the celebrity guests in attendance for Lady Gaga's iTunes Festival show last night (1st September).
The 'Bad Romance' star opened the month-long event with an eight-song set full of new material from her latest album 'ARTPOP'.
The 'Someone Like You' star made a rare public appearance to catch a glimpse of the US star.
You can check out a picture of Niall arriving at the Roundhouse in Camden at the top of the page: (Picture: Goff).
The show was Gaga's first full performance since undergoing hip-surgery last year.
Check out a picture of Adele heading to the Roundhouse in Camden to watch Lady Gaga below: (Picture: Xposure)
Other stars still to appear at this year's iTunes Festival 2013 include Justin Timberlake, Katy Perry and Jessie J.
Meanwhile, Adele is said to be currently busy working on her next studio album after becoming a first time mother last year.