The 31-year-old 'Keeping Up With The Kardashian' star has been dating the rapper for six months, reported Sun online.
"Kanye and Kim have figured out that if they combine their names it could be big business. They've both got massive fan bases who will buy their gear," a source said.
"It's also a sign that they're in the relationship for the long haul and that they think it's a romantic way to seal their relationship," the source added.
West launched himself as a fashion designer last year and Kardashian has had her own range of women's gear for some time now.
