While he is currently waiting for his delayed assault trial in jail, Chris Brown turns 25 on Monday, May 5. The R&B star is reportedly spending his birthday behind bars reminiscing about the good times in his life and considering proposing to his on-again-off-again girlfriend Karrueche Tran after jail.

Tran has always been supportive of the "Loyal" singer, and knowing that, Brown wants to marry her once he gets out of jail. "I don't know if that's him being lonely in jail, but that's what he tells her. He calls her his wifey and tells her all the time that she's perfect wife material," a source said. "He knows Kae is incredibly loyal and has literally put her life on hold to hold him down in jail. She's taken care of just about everything in his house."

"He basically told her that when he gets out things are going to be way different between them and that he's going to return all the favors she's given him with a surprise of a lifetime," the source added.

Although she has no thoughts of leaving the "X" singer, the model is not sure whether to accept a marriage proposal from him. "Karrueche isn't sure. She doesn't know, but she was very happy when he called her, 'Wifey,'" the source said. "She loves Chris to hell and back -- if he did propose to her, she would say yes."

Brown is reportedly not doing well in prison right now as he is having panic attacks and eating poorly. "Chris has not been getting any special treatment whatsoever while he's been behind bars," a source close to the singer said. "He's been having a very difficult time, pacing a lot, having mood swings, sometimes panic attacks. The only way to help sooth his nerves is to overeat, and the food in jail has very little nutritional value."

Brown is apparently spending his birthday just thinking about the good times in the past, especially with Karrueche Tran. "He doesn't have any plans other than to sit alone, by himself in jail, and reminisce about the good times in life," another source said. "He told Karrueche that he will be thinking about how she's treated him and stuck by him through everything and how he hasn't always been upfront and faithful. He will be spending that day coming to reality with his life and hopefully will move forward and make better choices and even get serious with Kae."

Tran took to Instagram to post a sweet photo of her with Brown celebrating. "Happy Birthday Christopher I love and miss you," she wrote the following caption. "Can't wait to give you a big kiss and hug."