One Direction star Harry Styles surprises close girl pal with birthday message from James Corden
James, 33, recorded a song on Alice's voicemail before calling her up from New York, where he's currently starring on Broadway in hit musical One Man, Two Guvnors.
'Just got your birthday song. Amazing. #appreciative #mademy18th xxxx,' Tweeted Alice to James.
'Lovely to talk to you #smashoed.'
James has previously spoken about being a fan of the One Direction boys while they've described him as a 'love guru' who gives great advice.
Harry, 18, knew that the Gavin & Stacey star would be up for surprising Alice, who's been his 'rock' since he first appeared on The X Factor in 2010.
'Alice has been there for two years of his mad life, she's kept him grounded,' a source tells The People.
'She's a huge fan of Corden's so he thought it would be the perfect birthday treat.'
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