Mariah Carey doesn't know the sex of her unborn baby, but insists she won't force pink on her child if it's a girl.

The 41-year-old diva - who confirmed last week she is expecting her first child - was a guest on the Ellen DeGeneres Show and was teased by host Ellen that she was going to love dressing up her baby if she had a daughter.

Mariah said: "I'm not going to impose pink on a girl. Do you think I'm really going to go that hard with it? That's how you get the exact opposite."

Ellen joked to the singer: "When that baby comes out you're going to have high heels on it like immediately. Little, tiny high heel shoes on that baby."

When the presenter asked if she could guess the baby's sex, Mariah said: "I would prefer not. Because imagine if you're a baby inside someone's body. Do you really want someone imposing their sex ideas on you? Not really? I'm just saying. Would you want them to be like it's definitely a girl... would you?

Mariah also revealed she is suffering uncomfortable morning sickness.

She said: "I get a little nauseous. It's like a constant ugh."

Portia de Rossi is taking on her wife Ellen DeGeneres' surname.

The 37-year-old actress - who married the talk show host almost two years ago - filed a petition in a Los Angeles court to formally become Portia DeGeneres.

Court papers state: "Petitioner is taking the last name of her spouse."

Portia signed the documents in March this year and filed them in Los Angeles Superior Court on Friday (06.08.10) but the name change won't be official until a hearing takes place on September 23.

Although Portia is cementing the couple's love for one another by changing her name it doesn't look as if children are on the cards for them.

Portia and Ellen married in front of 30 guests at their Beverly Hills home on August 16 2008.