Justin Bieber may be getting ready for his upcoming world tour, which starts on March 4, but he revealed to ET Online what his plans are for his upcoming 17th birthday, which falls on March 1.

Bieber said, "I only have, like, four days, so I'm just going to relax, because I start my world tour starting on [March 4] -- so just going to mentally prepare and just relax."

He did reveal that he had no plans for a large birthday bash. He said he hopes his grandparents would be coming to his home to celebrate with him, and he hopes to spend some time with them.

He also had another reason for wanting his grandparents there and that was the all important birthday cake. "My grandma makes the best cheesecake -- cherry cheesecake. She made that for my 13th birthday."

Bieber, however, did not reveal if rumored girlfriend Selena Gomez would be attending the birthday party.