The Private Practice actress admits she was inspired to create the scent after a break-up which left her missing the aroma of her former lover's cologne.
Boyfriend is set to be launched in the U.S. next month (Nov10) and Walsh hopes the fragrance will help women heal their own heartbreak.
She says in a statement, "You ever miss the scent of your boyfriend on your skin? Well, I did. So I created Boyfriend, a fragrance inspired by him but made for us. It's got all the floral notes that we ladies love and that warm, woody, amber musk that makes you purr like a jungle cat. Now you can take your Boyfriend with you wherever you go. Stay tuned... I can't wait for you to meet my Boyfriend."