Sunday marks the official first day of Spring and many celebs have already started adding more colour in their closets in various ways; this week it was denim.

Stars like Khloe Kardashian, Rachel Bilson and Anna Kendrick were all spotted rocking coloured denim jeans recently.

As colour-blocking is clearly one of the biggest trends for Spring 2011, denim seems to be a great way to add a lot of colour to your look without totally overdoing it and leaving room for more.

Anna Kendrick attended the Rag & Bone dinner at Intermix in LA on Wednesday night in a pair of Rag & Bone green jeans. She kept things cool by adding a Rag & Bone black sheer blazer, a Rag & Bone white top, gold accessories and Botkier black open-toe sandals.

Rachel Bilson was spotted leaving her hair salon in a pair of burgundy Paige denim jeans. A floral printed scarf, black blazer, Burberry Prosum Knight bag the from Spring 2011 collection and classic Ray-Ban Wayfarers top off this look.

Coloured denim is nothing new. Of course we remember SJP’s bright and yummy outfit of red jeans, a pink t-shirt and the Halston Heritage tie-dye sac bag she rocked back in September last year in New York City. It looked great then and stars made it look just as good this week.

I know I can definitely recall a few colourful jeans in my past; red, blue and even yellow.

It’s a wonderful way to stand out in style as we all prepare to say hello to warmer days.

Take your pick from these colourful jeans

Peach scalloped jeans
Topshop International £40 Topshop US $80
Ralph Lauren Thomson skinny jeans
Acne skin high-rise skinny jeans
Net-A-Porter International £170

Credit: PacificCoastNews, Fame Pictures & BFAnyc