The glamour model, 36, announced on Twitter a fortnight ago that the couple were getting a divorce, just days after sharing the news that they were set to become parents again.
She said her marriage was over and accused third husband Kieran Hayler of cheating on her with her best friend Jane Pountney.
Now Hayler has sent messages on Twitter declaring that he wants to "repair" his estranged wife's heart.
"Happy birthday to my beautiful wife @MissKatiePrice. I love you with all my heart forever and always," he wrote.
"@MissKatiePrice I will repair your heart and I am looking for the light at the end of the tunnel for our fairy tale ending! Believe in me xx"
Earlier this week, Price thanked fans for their support during the turmoil in her personal life and dismissed speculation that her marriage split was a publicity stunt.
She had tweeted that she was divorcing Hayler a little over 16 months since they married and just days after announcing that she was pregnant with her fifth child.
She told her fans: "Sorry to say me and Kieran are divorcing. No human being deserves this especially being six months pregnant. Worse pain in the world."
A statement posted on her website later said: "I am appalled that someone I loved, trusted and believed in has behaved in this way. If he had so little respect for our relationship I would have hoped he would have thought about our child, or the one that we have on the way.
"That he did not means he will no longer be part of my life. I will do all I can to ensure he maintains a relationship with his children should he want that. I am so grateful for the love of my children and family at this time."
Price was previously married to Peter Andre and Celebrity Big Brother contestant and cage-fighter Alex Reid.
She and Hayler had their first child together, Jett, in August last year. She also has two children, Junior and Princess, from her four-year marriage to Andre and a son, Harvey, from her brief relationship with footballer Dwight Yorke.