Chris Brown's birthday is on May 5 and Rihanna will reportedly puchase an expensive item that will be just the "main gift."

The Stay singer has reportedly purchased a limited-edition 2009 Mercedes Benz McLaren SLR Stirling Moss; only 75 were made.

"Rihanna has spent more than a million dollars on his main gift - a custom-made car," a source told Naughty But Nice Rob. "She's had his initials put on the red leather seats."

According to exoticcars.com, the 2009 Mercedes Benz McLaren SLR Stirling Moss is supplied with a hemlet and racing goggles, has gullwing doors and cannot be driven in the United States.

See photos of the exotic 2009 Mercedes Benz McLaren SLR Stirling Moss here 

According to another report, Rihanna has a concert in New York on his birthday so she is secretly hoping that Brown will come to the Big Apple so they can celebrate it together. 

"Chris treated her so bomb and surprised her with his presence when she turned 25, she wants to be with him badly when he turns 24," a source told Hollywood Life. 

As for the birthday plans in addition to the exotic car purchase, "it's a surprise," the insider said.

"All I can say is she's got a few things up her sleeve. She wants Chris to know how much she loves him and wants him and honestly, she just wants to be with him and let him know she's got his back." 

Enstars reported that Brown spent quality time with Rihanna in Hawaii the week of her birthday on Feb 20. The couple was seen taking a stroll on the beach together, riding a limousine one day, a jet ski another and she shared pictures taken at her private birthday party at a Hawaii hotel room. 

The Fine China singer dropped $65,000 on a pair of Neil Lane diamond chandelier earrings for her.  According to a report, Brown saw how much she gushed over the earrings when the jeweler-to-the-stars loaned them to her for a glitzy event. 

"Chris wants to prove he's more serious now," a source told InTouch about the reason he purchased the pricey gift.

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