Miley Cyrus wants to prove she doesn't care about Patrick Schwarzenegger.

The 22-year-old singer, who recently split from the 21-year-old student after six months of dating, is reportedly partying up a storm because she doesn't want anyone to think she is upset.

A source told InTouch Weekly: ''She's on a crazy tear. She's going way overboard to prove to everyone, especially Patrick, that she doesn't care about him and that she's moved on.''

But the 'Wrecking Ball' hitmaker is secretly devastated and ''has been crying her eyes out.''

The insider said: ''Deep down, she's really hurt. And instead of dealing with it, she's hooking up with random people and partying almost every night.''

The blonde beauty's friends are also allegedly concerned she is texting her ex-fiancé Liam Hemsworth again.

The source said: ''Miley suffered a lot of emotional turmoil when she was with Liam. Her friends are concerned because it was such a toxic relationship.''