Billionaire & Scoundrel by Ella Valentine

Adam Walter has had a life of excesses: drugs, alcohol, women… But now that he has come out of rehab and is about to assume his post on the multinational managed by his father, he needs to clean his reputation with urgency. He hires a reputation management specialist, who assures him that the best way to achieve this is by faking a stable relationship with a normal girl.
This normal girl is Lena Murphy, who has not had an easy life: her parents died when she was a teenager, she doesn’t have a family and she can hardly make ends meet. Lena recently lost her job and is desperate to find one, so when she is proposed to impersonate the bride of the heir of one of the most important fortunes in New York with a generous amount of money, she accepts out of sheer necessity.
Adam and Lena will have to pretend to be a couple, but where does the lie ends and the truth starts?