He may be a 'Glee' superstar, aka Blaine Anderson, by day, but by night, he's just Darren Criss ... Successful musician. Criss stopped into London's oh-so-intimate Borderline club recently, where he performed a slew of recognizable hits.

Criss took a stand onstage at the small club, where screaming girls and guys packed the room. Holding only a guitar, he played a full list of songs from his past albums, 'Starship,' 'A Very Potter Sequel,' and the solo 'Human' record -- and even gave a special shout-out to one of his favorite redheaded girls.

Don't worry, ladies, she's as fictional as they get, and even has a tail! Criss performed a sing-along rendition of 'Part of Your World' from Disney's 'The Little Mermaid,' much to the delight of the lucky fans who were able to attend the Criss-centric gig.

It's great to see the D-man singing his heart out, but we prefer it when it's on our television screens a la FOX. Darren Criss and the gang will return with Season 3 of 'Glee' this fall!

Watch Darren Criss Perform 'Jealousy' and Disney's 'Part of Your World'