Former Atomic Kitten star Kerry and former Westlife star Brian, both 40, took to their Instagram pages to share adorable photos of their teenage daughter from throughout her childhood.
Kerry, who recently slammed Paris Fury after she said she would pleased if her dog died, shared a collage of snaps from her adorable little girl.
The pictures of Lilly-Sue show her as a baby, toddler and during her later years in Kerry’s post, which she shared with 649,000 followers.
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Mum of five Kerry then wrote in the caption: “Happy 18th @lils.mc” followed by a red heart emoji.
Meanwhile Flying Without Wings singer Brian, who is expecting a baby girl with Danielle Parkinson, posted a series of snaps of himself with his adorable blonde daughter throughout the years.
One throwback snap showed Brian wearing a black and red hat along with a red hoodie as he smiles next to his little girl.
Tiny toddler Lilly-Sue is wearing a pink top as she looks away from the camera.
More snaps show Lilly-Sue as she’s older including a lovely image of Brian cuddling a teenage Lilly-Sue while sat next to his fiancee Danielle, 39.
He penned next to the collection of pictures: “My little girl is 18 today. I say little girl but she’s actually grown into a beautiful , intelligent and strong minded woman.
“Why do our babies have to grow up so fast?! I love you @lils.mc Happy Birthday my darling xx”.
Celebrity friends commented on the post from Lilly-Sue’s parents shares to wish her a happy birthday.
Gemma Collins said: “Happy birthday darling” followed by a pink heart emoji.
While Lizzy Cundy added: “Happiest of birthdays dear Lily”.
And The Only Way Is Essex star James Argent wrote: “Happy Bday Lilly”.
Kerry and Brian share daughters Lilly-Sue and Mollie, 19, together.
The singers met in 1999 and dated for three years before they tied the knot in County Meath, Ireland, back in 2002.
After two years of marriage, the couple split. Kerry went on to have Heidi, 13, and Max, 12, with ex Mark Croft, who she married in 2007 before splitting in 2010.
Kerry then began dating George Kay, who tragically died in July 2019, in 2012 before marrying in 2014.
The pair shared six year old daughter Dylan-Jorge together.
Most recently, Kerry has found love with Ryan Mahoney after the pair met on a dating app. Ryan, 31, asked Kerry to marry him in a romantic proposal during her 40th birthday celebrations in August 2020.