Yesterday evening (6 December), the 'Someone Like You' singer looked fresh-faced with barely any make-up on and her famous flame-coloured hair swept away from her face in a loose high bun.
The London-born superstar, 25, was dressed top to toe in black, hiding her much speculated about figure in a loose-fitting dress teamed with dark leggings.
It was a very rare appearance from Adele since giving birth to Angelo James in October 2012.
She attended the Lady Gaga gig at private members' club Annabel's in London's Mayfair with partner Simon Konecki - and the loved-up pair looked absolutely smitten with each other.
Adele is clearly a big fan of Lady Gaga's as the last time she was spotted was at another one of her gigs in September...
Jessie J, Emma Watson, Suki Waterhouse, Bar Refaeli and Eddie Redmayne were also present at the intimate event.
Do you want Adele to come back into the spotlight and release more music? Tell us below!
Watch the video for Adele's single 'Someone Like You':