There’s no straight answer to what to write ... birthday wishes work for the best guy in your life, whether you’re wishing a happy birthday to your husband, son, brother, boyfriend or another ...

but many folks have trouble figuring out what to write in a birthday card other than the obvious 'happy birthday' phrase. Thankfully, finding the right birthday card messages is a piece of cake!

The singer, 25, shared a cute black and white tribute to her boyfriend Evan Peters, 33, on her Instagram Monday in celebration of his birthday. “Happy birthday darling,” Halsey wrote.

Jordon Hudson had a nine-word message on Instagram for Bill Belichick, who turned 73 years of age on Wednesday.