The Flood singer probably spends a fair bit of time on the phone to her Black Eyed Peas pal while he's in LA and she's in London.
And Cheryl, who could be joining Will in LA if she takes a job on the new US X Factor, admits she loves hanging out with the singer.
According to British newspaper the Daily Star Sunday the 27-year-old said: 'He calls and says 'yo' before putting on voices or he'll do characters.
'You feel like you’re back at school when the teachers used to read books in funny voices.'