Uh oh. Lady Gaga‘s much-used and heavily followed Twitter account has been hacked. The singer, who boasts more than 17 million followers, posted a tweet early yesterday morning offering up a free iPad2 to little monsters as Christmas presents. Warning: Do not click the link included in the tweet, as it’s not valid and could cause damage to your computer.

While Gaga is known for being a kind and generous Mother Monster, the idea that she could gift her millions of little monsters and followers with expensive, sought-after new tech gadgets at the height of the holiday season by clicking on a link is as suspicious as an email from the Prince of Nigeria offering you incredible sums of money if you send some first. They’re both obvious web-based scams.

And if you grab a calculator, like one of our savvy PopCrush staffers did, and do the math, if Gaga bought each of her followers an iPad2, it would cost her $8,538,981,313. Yes, over 8 billion bucks. On the flip side, there’s also no way Apple could stay in business by comping Gaga that many tablets, either. If Apple crumbles, our economy does, too.

The hacked tweet read as follows: “Monsters, I’m giving away FREE iPad2′s to each one of you in the spirit of the holidays :) Go to http://bit.ly/s5MTqM to receive one!”

So beware, monsters. Don’t click the link. Let’s hope the damage is minimal and Gaga’s followers are smart enough to ignore this malicious hacker’s tweet.

This isn’t the first time that Gaga has dealt with cyber problems in 2011. Her YouTube account was suspended this summer and her U.K. website was hacked, as well.

Time to change that password, Gaga! Since Gaga is so communicative via Twitter, we’re sure she’ll have a response in no time.