Everyone noticed Prince Harry Pippa Middleton having a laugh together at the Royal Wedding.
Pippa's big sister Kate, 29, met Prince William when she started university at St Andrews, so their siblings have often been thrown together.
Pippa, 27, and Prince Harry, 26, are like ‘kindred spirits', says a friend.
'They get on extremely well and flirt with each other, but it's all playful. Nothing will happen.
They've had nights out at Boujis and Whisky Mist where they'll compete for who can down the most shots.
'They'll be the first to start dancing and the last to leave.
'She's not a silly drinker, but she knows how to party, which is why her and Harry get on so well.'
NEW PICTURES Prince Harry and Chelsy Davy's love story in photos>>
Read the full story about Pippa Middleton and Prince Harry in Now magazine dated 16 May 2011 - out now!
NEW PICTURES Royal Wedding crowd celebrate Kate Middleton and Prince William's big day>>
ROYAL WEDDING GALLERY See the guests arrive for Prince William and Kate Middleton's special day>>
NEW PICTURES Kate Middleton and Prince William are married at last>>
NEW PICTURES Prince William and Kate Middleton visit Lancashire before the Royal Wedding>>
MORE PICTURES Amazing facts about Kate Middleton - Prince William's wedding belle>>
NEW PICTURES Prince William revealed! Amazing facts about Kate Middleton's man>>
SEE PICTURES Kate Middleton and Prince William: Their love story in photos>>
PHOTO GALLERY Kate Middleton watches Prince William play polo>>
PICTURE SPECIAL Kate Middleton and Prince William appear together at first public engagement>>
NEW PICTURES Kate Middleton and Prince William attend wedding>>
PHOTO GALLERY Kate Middleton gets into Christmas spirit at charity do>>
