Kim Kardashian is determined to lose 20lbs.

The reality TV star took to Twitter to post a picture of herself five years ago in which she sports a leaner figure - and it appears the picture has inspired the 33-year-old beauty to shed some weight.

Kim tweeted: ''ughhh I am 20 lbs lighter here! This was just 5 years ago! Ok I'm going back on my grind. I gotta get back here! (sic)''

The photograph shows Kim wearing a tight grey and white cut-out dress, which she matched with a pair of black high heels.

Kim - who has 13-month-old daughter North West with husband Kanye West - was recently said to be on a strawberries only diet.

Last month, it was reported the 'Keeping up with the Kardashians' star was trying out yet another fad diet, which requires her to eat nothing but strawberries for each meal of the day.

A source told The Sun newspaper: ''She's giving it a go a few days of the week.

''She has strawberries for breakfast and lunch and strawberry smoothie snacks inbetween.''

In addition to only taking part in the diet for a number of days out of each week, she's also allowed to have a cheat meal every now and again and reportedly plans to indulge in alcoholic treats.