Richie 'spends $20,000 a year on underwear'

Nicole Richie reportedly spends $20,000 on underwear every year.

The 'Candidly Nicole' star - who has children Harlow, six, and Sparrow, four, with husband Joel Madden - works hard to keep a "spark" in her marriage, even when the Good Charlotte rocker is working on 'The Voice' in Australia.