Lindsay Lohan has thrown Internet gossips into a spin by suggesting she is pregnant.

The Mean Girls star sparked the rumour with a post on her Twitter.com page, writing, "It's official. Pregnant..."

Lohan's message was posted on 1 April (13) at around 10.30pm Pst (Pacific Standard Time), suggesting the actress could be playing a late April Fools' Day joke, but the tweet sparked a frenzy on the social networking website.

The posting has since been re-tweeted by more than 10,000 users and has become a worldwide trending topic.