Kat Dennings, Beth Behrs Kat Dennings, Beth Behrs

Contrary to a recent report, 2 Broke Girls stars Kat Dennings and Beth Behrs claim Lindsay Lohan was nothing but professional and sweet on set.

On Friday, Contact Music published an article citing an unnamed source on the gossip blog Crazy Days and Nights, who said Lohan was a "train wreck" last week while filming her guest appearance for the CBS comedy.

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"There is not a member of the audience who couldn't do a better job than Lindsay Lohan did last night," the source wrote, adding that Lohan couldn't remember her lines and was unable to speak properly due to the amount of Botox in her lips.

But Dennings and Behrs are now saying that's not true. Both defended Lohan on Twitter. "This article is complete bulls---," Dennings tweeted on Friday. "Lindsay was prepared, sweet to everyone, & professional. Not nice to spread lies."

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

Which account do you believe? Lohan's appearance on 2 Broke Girls is set to air on Monday, April 14 at 8/7c on CBS.

(Full disclosure: TVGuide.com is owned by CBS.)