Scottish actor Martin Compston fell victim to Internet pranksters on Monday (25Mar13) when his account was illegally accessed.

A message promoting weight loss popped up on the 28-year-old Sister star's page, and he was less than impressed with the hack.

In a post, he writes, "As you've probably guessed folks I'm not a diet expert some t**ser hacked the account great to find after finishing work! Apologies."

However, Compston was quick to take action, asking his followers, "How do you change the password on Twitter from your iPhone?"