Aaliyah is now a Barbie girl. The late Detroit R&B singer, who died in 2001 at the age of 22, has been immortalized in Barbie form. Toymaker Mattel introduced the Aaliyah Barbie Thursday, on what would have marked the singer’s 46th birthday. The doll was made available at MattelCreations.com starting at midnight but was sold out within 30 minutes. It retailed for $64.99, which included a 1-Year membership to Barbie Club 59, which allows members access to exclusive deals. The doll may also be available at select Target locations and on Target’s website, according to Mattel’s website. There are dozens listed for…