Christine Lampard asserted she was proud to be step mum to Frank's daughter Isla.
The Loose Women star paid tribute on her step daughter's 13th birthday on Instagram with a wheel of lovely photographs.
Christine stepped into the role of step mum to Frank's daughters Luna, 14, and Isla, 13, when she married the former footballer in 2015.
With loving words, the TV sensation hailed Isla as a "beautiful young girl" who made her "very proud" to be her step mum.
The step mum paid tribute with sweet snaps from one of their Christmases, Christine and Frank's wedding day and the girls appearance on Loose Women.
She wrote: "How are you 13 already @isla.rl what a beautiful young girl you are!
"I feel very proud to be your step mum. We love you so much and thank you @fondant_fleur_cakes_ for the best cake (not an ad, just showing appreciation)."
Frank shares his two eldest daughters with his Spanish model ex Elen Rivas.
In 2018, Christine became a mother for the first time when she welcomed her daughter Patricia into the world.
Earlier on in the year, the mother-of-one explained how being a step mum had prepared her for the challenges of motherhood.
But she admitted the baby years were completely a fresh slate for her as she vowed to take it day by day like every new mum.
She said: "I have had the girls since they were 4 and 2 and they are 13 and 11 so I have been through all the toddler years, the primary and secondary school bit and teenagers are around the corner, that is preparation, although the baby years is all new to me!
"So I’ll take it day by day really, like every other new mum."
It comes a week after Christine returned to work on Loose Women amid the raging coronavirus pandemic sweeping the globe.
The mother was sat two metres away from the other panelists as they stuck to social distancing guidelines.
No live audience were present during the filming.
Christine wrote: "It was great to be back."
