*For his 21st birthday, Soulja Boy turned his swag on by dropping $55 million to purchase a private jet, , a member of his management team tells TMZ.

The rapper, who turned 21 on Thursday, spent $35 million on a Gulfstream G5 jet and paid another $20 million on upgrades, such as custom Italian leather seats, flat screen TVs, four liquor bars, a customized travertine-tiled floor, a revamped bathroom and Brazilian hardwood cabinets.

He’s also shelling out cash for a custom paint job that will feature his logo.

Meanwhile, Soulja Boy is throwing a $300,000 birthday party tonight in Miami. Sean Kingston, Bow Wow and Dwight Howard were among those who made the guest list for the bash, which will be streamed live – for a fee – on his website.