Miley Cyrus to start acting like a role model?

Miley Cyrus has promised her parents that she'll start acting like a role model.

"Even though Miley is of legal age and able to make her own decisions in most matters, she still remains very close to her parents," a source told American tabloid the National Enquirer.

"She's headstrong and likes to make her own decisions, but she truly loves her Mom and Dad.

"She knew right away that this video of her partying with 'pals' and puffing on a bong would send them over the edge.

"After listening to their terrible fears that she's heading down the wrong path and losing control, Miley made this solemn vow to her parents: She will straighten up and start acting like the role model to young fans that she should be!"

Miley Cyrus Drug Use Pictures & Video?

Troubled pop star Miley Cyrus celebrated her 18th birthday by experimenting with a bong reports TMZ.

In video shot during a party at Miley's L.A. area home 5 days after her 18th birthday, the Disney star is shown with the bong to her head before catching a case of the giggles.

"I'm having a little bit of a bad trip," Cyrus says , "Is that a Liam look-alike - is that my boyfriend?"

"Is that me tripping? Does that look like Liam at all?"

"I want more of that s---."

The bong is reportedly filled with the natural herb called salvia which has psychedelic qualities. Possession of salvia is legal in California.

The video shot by a friend of Miley's was reportedly stolen or copied from that friend's camera.

Miley Cyrus trying to be strong going through her parent's breakup

Miley Cyrus has been acting out since her parent's divorce, but she's also really hurting.

"Miley is trying to be strong going through her parent's breakup and she loves them both," a friend insists to Hollywoodlife.com. "Everyone is reading into each of her every moves, like when she goes out with her mom and no one sees her dad. It's pushing her buttons."

"She's trying to focus on her new movie and staying strong, but some of us are worried about her," says the source. "She's putting on a brave face, but she seems tired and stressed."

Miley Cyrus girls' day out with Mom

Miley Cyrus treated her mom to a girls' day out for thanksgiving. .

Cyrus and her mom Tish got their nails done and shared a ladies' lunch reports PEOPLE.

At Cosmo Nails in Toluca Lake, "Miley and her mom enjoyed pedicures and seemed very happy to spend some alone time," an onlooker says. "They kept chatting and were both in a great mood. Miley treated her mom and she was very sweet and also left a great tip."

At Panera Bread, "Tish and Miley kept hugging at the table. They were talking a lot and both seemed very happy," an observer says. "A few fans approached Miley and she was very nice to them."

Miley Cyrus worried she could end up washed up

Hannah Montana actress Miley Cyrus is worried she could end up washed up.

"Miley loves being successful -- she doesn't know anything else. But she's worried she could end up washed up like all the other former teen stars out there.

"Turning 18 has got Miley thinking about her future in Hollywood and how she's going to keep her career white-hot for as long as she wants it to be."

Miley recently insisted she puts her career above all anything else.

"I definitely don't want people to think I'm trying to get married anytime soon," she said. "I'm way too driven right now, first of all, I'm 17, it's ridiculous, and second of all, I've got so much work I want to get done. I have so much to do, there's no way it's happening.