Gillian Dianna Savannah Cowell is 19 year old girl...she was born in Ireland ..and yes she is no other than Simon cowell's daughter...she has a crazy life...its because she is a celebrity....she was very close to Demi Lovato,Taylor Swift and Selena Gomez..well Gillian and Demi grew up together they treat each other like sisters...
Gillian has a best friend named denise kelly well now its denise horan..she married greg horan...oh and by the way Greg Horan is her second best friend they were neighbors and her mom and his mom was bestfriends....and there she meet Niall Horan they both became so close...
when they were 10 years old something happend...but only Niall and Gillian know about this..