The 'Wannabe' hitmakers partied ''until the break of dawn'' with their former rival after they performed at the London 2012 Olympics closing ceremony last night (12.08.12).
The ex-Oasis singer angered the girls when he said in 1997 he wasn't going to the Brit Awards because if he bumped into the Spice Girls, he would ''smack them''.
Mel C announced while accepting an award that Liam could ''come and have a go if you think you're hard enough''.
The singer, also known as Sporty Spice, jokingly tweeted: ''Love @liamgallagher 'come and 'ave a go! (sic)''
The singer captioned the image: ''Party till the break of dawn, and Mel is still l in her Outfit (sic).''
Mel C added: ''Ha ha! Had one hours sleep, too excited! (sic)''
The band's fifth member, Victoria Beckham, went home after their reunion performance.