2 Broke Girls stars Kat Dennings and Beth Behrs have come to the defence of Lindsay Lohan following rumours suggesting the actress was a "train wreck" while filming her cameo on the hit comedy series.

The Mean Girls star shot a guest spot on the popular U.S. sitcom last week (10Mar14), playing an indecisive soon-to-be bride who asks cash-strapped roommates, Dennings and Behrs, to make her wedding cake.

However shortly after shooting, an audience member took to the Internet to write a blog post, calling Lohan's appearance a "train wreck", alleging she repeatedly fumbled her lines and didn't "take the job seriously".

However Dennings has since taken to Twitter.com to shut down the blogger's allegations and praised Lohan for her work, writing, "This article is complete bulls**t. Lindsay was prepared, sweet to everyone, & professional. Not nice to spread lies."

Behrs later adds, "This article isn't true. I second @OfficialKat. @lindsaylohan was kind to everyone, professional and knew her s**t."

Lohan's episode is slated to air in America on 14 April (14)