Lily Allen's 2009 single, 'Who'd Have Known', is sampled in rapper T-Pain's new single, '5 O' Clock'.

Seen as the song from her number one album, 'It's Not Me, It's You', is sampled throughout the entire song, her name is credited as a feature along with Wiz Khalifa.  

'5 O'Clock' is taken from T-Pain's fourth album, 'Revolver', and he collaborates with artists like Chris Brown, Akon and Cee-Lo Green on other tracks. 

There is no release date yet for 'Revolver' but it is expected to be released by the end of 2011. 

Check out the video for T. Pain's '5 O'Clock' feat. Lily Allen and Wiz Khalifa and Allen's original version, 'Who'd Have Known':