The Irish Prince by Virginia Nelson

CEO Aiden Kelley’s life of billionaire extravagance is flipped upside down when his ex shows up with a ten-year-old she claims is his. Totally out of his element and losing the control so integral to his success, he needs help. To top it all off, the only constant woman in his life, his executive assistant, has given notice just when he needs her help to survive his newfound fatherhood.

Chelsea Houston is an executive assistant, not a nanny. The only person more clueless about kids is her boss. Helping him on a daddy-daughter road trip is her last task before he’ll accept her two weeks’ notice and she can be free of the infuriating man she’s had a crush on for longer than she’d admit.

Aiden’s carefully ordered life has never been so disorganized, and he’s suddenly tempted by the things he thought he could never have. Things like love and family. Who knew chaos could be so damn fun?