Lily told how she had a "weird dream" about the Born This Way hitmaker, prompting the US star to make the revelation about how she had been thinking of her while composing the 2009 track, included on her The Fame Monster album.
"I had a really weird dream about Lady Gaga last night."
"@lilyrosecooper Next time you have that dream can u take lots of pictures so I can see?"
Lily – who is currently expecting her second child with husband Sam Cooper – then wrote:
"@ladygaga god I hope it doesn't happen again, if I wasn't with child I would have chomped my way through a bottle of Xanax by now #theanxiety (sic)."
Gaga wrote back:
"@lilyrosecooper that would never happen! Wed more likely kidnap you + beg you to sing 'So Happy I Could Die'. thought of you when I wrote that (sic)."