Enlarge

How long have we got? Marc Jacobs (see left) has been a prominent fixture on the design scene since he launched his own label in 1986, but he didn't stop there and has since bought us Marc by Marc Jacobs, a more youthful (and cheaper) take on his main line, Marc Jacobs menswear, Little Marc Jacobs for kids and a perfume range. Somewhere he also finds the time to be creative director for Louis Vuitton - and has done so since 1997. Phew, we're worn out just thinking about it.

Left: Marc Jacobs