Miley Cyrus might be dating boyfriend Patrick Schwarzenegger for a couple of months but he still couldn't spell his name. Meanwhile, the "Wrecking Ball" singer followed in the footsteps of Rihanna as a MAC endorser.

In an interview with Cameron Mathison on Good Morning America to promote her MAC ad campaign, Miley Cyrus was asked about his boyfriend Patrick Schwarzenegger and to spell his name.

"Literally, I just had this conversation, I can't tell you! Apparently there's not a T in it," she said.

The lovebirds just came back from a Hawaiian vacation right after welcoming the New Year in Las Vegas.

The "Wrecking Ball" singer joins Rihanna, Nicki Minaj and Lady Gaga as endorser for MAC's cosmetics, said ABC News. The proceeds from the products will go to support the foundation working for people with HIV and AIDS.

"It's fun for young people to get to buy a lipstick and know that it's going to actually go to changing the way that their future is going to be," Miley Cyrus said.

Although the former "Hannah Montana" has invited controversy with her racy concerts and photographs, Miley Cyrus still considers herself as a role model: "I can actually say I am for what I know of what is important to teach people -- and what is important to teach people is that ... you can't judge other people."

"I realized that if there's going to be all this attention on me all the time, no matter what I say, no matter what I do, I should be saying something and speaking on behalf of those that kind of feel like they have no voice," Miley Cyrus added.

Miley Cyrus and boyfriend Patrick Schwarzenegger reportedly started dating in November last year after they were snapped kissing in a football game. Previous reports claimed that the son of action star Arnold Schwarzenegger has a long-time crush on the "Wrecking Ball" singer.