SOLVED. Adult Contemporary Romance. Where the hero raised the daughter and not the heroine. [s]

[Intisaar]

Hi, I'm looking for the name of a book I read a few of years ago. I don't remember the year. The book starts with the hero finding a baby who was left on his door step. He does a DNA test and finds out that he's a father. Years later he was celebrating his 4 year old daughter's birthday (who's name is Rosaline I think) when the mother shows up. He called the police because he believed she stole something from him but she was let go due to lack of evidence. They talked later and she said that she wants to get to know her daughter. It was also revealed that they shared the same traumatic past. Spoiler...
It was revealed that she wasn't who she said she was, that her twin is the real mother and that her name is actually willow. I remember the plot but not the name of the book so if anyone knows it please let me know, I would appreciate it.

[Brenna]

The Regret Duet by Aly Martinez seems to match. The first book is Written with Regret followed by Written with You

[Intisaar]

Thank you!