John Cena is celebrating his 43rd birthday with his stunning girlfriend Shay Shariatzadeh, 30, by his side! “John doesn’t have any big plans for his birthday…he’ll probably just relax, have a nice dinner with Shay and enjoy an evening at home,” a source close to the wrestling star spills to HollywoodLife EXCLUSIVELY. John, who is a Taurus, celebrates his special day on Thursday, April 23.