Pregnant Kim Kardashian has revealed her secret to preventing stretch marks.

The 32-year-old reality TV star - whose boyfriend Kanye West announced she is expecting their first child late last month - has admitted she is already lathering her body in Bio-Oil in a bid to prevent stretch marks during her first pregnancy.

According to the MailOnline, the 'Keeping Up With The Kardashians' beauty shared her top tip with fans and also revealed she uses the cheap beauty product to help keep her looking young, saying: ''It prevents wrinkles around my eyes and stretch marks over my body.''

Known for her slim curves, Kim also recently revealed she has changed her fitness routine to help her stay in shape.

The 14-weeks pregnant star told fans of her official blog on Thursday (03.01.13): ''Tracy Anderson is keeping me in shape! She is helping me make the adjustments necessary to keep me feeling happy, healthy and most importantly create a workout plan that is safe for the baby.

''It's really important for me to have a fitness routine that works for my body and my schedule and I'm really happy with the workout plan Tracy is working with me on.''

Meanwhile, the brunette beauty has sparked rumours she and Kanye want to make Beyonce and Jay-Z, whose own daughter Blue Ivy turned one yesterday, their baby's godparents after her boyfriend of nine months tweeted a picture of the four of them together with the caption 'Fam'.