The 'Wannabe' girlband have teamed up with the Hard Rock Cafe to create the T-shirt, which is to help raise money for Chickenshed, a charitable theatre company that offers performance education courses for young people.
The T-shirt features a butterfly print with each of the Spice Girls' signatures.
"Chickenshed offer such an amazing range of performing arts courses and give so many young people a direction and passion for theatre, which they will keep for the rest of their lives," Mel B explained in a statement.
"As a mum I know how important it is to give kids the best possible start in life and, for that reason, this is an amazing cause that I'm proud to be a part of as it gives so many disadvantaged children a chance to change their lives for the better."
Baby Spice Emma Bunton added: "I've been a big supporter of the Chickenshed Theatre Company for a while now and it's great news that they have teamed up with Hard Rock Cafe to launch a Spice Girls T-Shirt."
The T-shirts are on sale now exclusively at the Hard Rock Cafe.