Khloe Kardashian is auctioning off some of her old underwear for charity.

The 'Keeping Up With The Kardashians' star has uploaded a number of pieces of lingerie on her eBay site in a bid to raise funds for her husband Lamar Odom's charity Cathy's Kids, which is named after his late mother Cathy Mercer and benefits underprivileged children living in New York City and downtown Los Angeles.

Among the intimate items on sale include a sports bra that is advertised as ''pre-owned'' and several silky nightgowns.

'The X Factor' USA co-host is also selling a few other items from her wardrobe including a grey knitted Wildfox top and a pair of AM aviator sunglasses, which have both attracted a significant number of bids.

Khloe - who runs the high-end boutique Dash with her sisters Kim, 32, and Kourtney, 33, - set up her own online store last summer.

Kim also has her own eBay store and sold a huge number of items from her wardrobe last year, from which she donated a portion of the proceeds to Life Change Community Church.

Online sales isn't the only thing the sisters have in common.

Khloe, 28, is also said to be hoping to follow in Kim's footsteps by getting pregnant by the end of the year so that their babies can be around the same age.

A source previously said: ''Now that Kim is pregnant, Khloe is making it her top priority to get pregnant next. She really wants her kids to be the same ages as their cousins and is starting to panic a little.''

Khloe was previously said to have put her plans to start a family on hold after she landed a job as co-host alongside Mario Lopez on 'The X Factor' USA.

But the brunette beauty is now said to be eager to begin fertility treatments again regardless of whether her contract on the series is renewed.

A friend said: ''Even if she gets 'The X Factor' hosting gig again, she will continue on with her fertility treatments. She isn't jealous of Kim, more so just very inspired.''

Kim is due to give birth to her first child with Kanye West in June.