Lindsay Lohan tweets: 'Its official. Pregnant...'

Is it an April Fool's joke?

Perpetually unpredictable Lindsay Lohan, who made news yesterday by spilling out of her dress while getting out of a helicopter in Brazil, is making more news today with a mysterious Twitter entry.

It could be that her account was hacked. But many are chalking up to being an April Fool's joke even though she seems to have tweeted it in the wee hours of April 2. It has been re-tweeted more than 12,000 times.

Lohan, 26, recently started dating musician Avi Snow and must start 90 days in rehab by May 2.

She wasn't the only star to try to punk followers on April 1. Snooki posted a photo of herself in a wedding dress saying, "Jionni and I eloped ... here's a pic of the magical day!" She later wrote: "APRIL FOOLS ya freaks!!" She added that she'll "have a huge wedding lets be serious lololol"

Meanwhile, new photos are out from Lohan's guest-start stint on FX's "Anger Management." She play herself as a patient to Charlie Sheen's therapist. The episode is slated to air on April 11 at 9:30 p.m.