The 'Smile' hitmaker - who announced last year she was working on her pop comeback after retiring in 2009 - had a vision in her sleep that she was a member of the British boy band and performed a rendition of TLC's 1999 single 'No Scrubs' with the guys.
She wrote on Twitter: ''had a dream that I joined One Direction last night. Harry was nice, and we did a cover of TLC's ''No Scrubs''. That is all. (sic)''
Meanwhile, Lily - who has two daughters, 15-month-old Ethel and two-month-old Marnie, with husband Sam Cooper - has developed an unusual scab after falling over and cutting her knee last week.
She tweeted: ''I fell over and scraped my knee and now I have a scab shaped like Africa !!! #interesting (sic)''
The 27-year-old singer - who has two daughters, 15-month-old Ethel and two-month-old Marnie, with husband Sam Cooper - recently complained she is ''bored'' and is looking for something to shake her out of her daily domestic routine, other than responding to her critics on Twitter.
She tweeted: ''Sometimes I wish I had better things to do with my time then change nappies, cook dinner, watch s''t telly and respond to Internet trolls. #bored #needtogetoutmore (sic)''