Rihanna and Chris Brown are moving in together. The "Umbrella" singer - who has been looking at multi-million dollar mansions in the Hollywood Hills area of Los Angeles - is planning to set up home with Chris as soon as she chooses a property.

X17 reports: "Once Rihanna moves in to her new pad, Chris Brown will be joining her!"

Rihanna has been house hunting in the Hollywood Hills. The "Take a Bow" singer reportedly spent Monday looking at properties in the same exclusive area of Los Angeles where celebrities such as Leonardo DiCaprio, Nicole Richie and Cameron Diaz live, according to X17Online.

Rihanna, 21, is also believed to have viewed Christina Aguilera's former Hollywood home, which is closer to the city's shops and clubs than her present house in the quiet neighborhood of Los Feliz.

Duffy's shyness almost stopped her from becoming a singer. The Welsh songstress - who picked up the Best Pop Vocal Album prize for her debut LP Rockferry at this month's Grammy Awards - nearly chose swimming over singing because of her nerves.

She said: "As a kid, I never wanted to be a singer - I was far too shy - but I needed a way of externalizing my thoughts because I was always talking s**t. I used to be a good swimmer but I got picked on in the pool."

Christina Aguilera wants to tone down her singing voice.

The "Dirrty" singer has been working with her favorite band, electro pop outfit Ladytron, to help her develop a "softer vocal sound."

Duffy wants to sound like Mariah Carey. The Welsh singer, whose retro tones won her Best Pop Vocal Album at the Grammy Awards on Sunday, reportedly intends to explore a more modern sound now she has established herself on the world's music scene.

A source told Britain's Daily Star newspaper: "She is keen to explore a Mariah or Christina Aguilera style of album. On the next record Duffy can afford to be a bit more experimental now that she is assured her position as a singing force to be reckoned with."

Christina Aguilera and Nicole Richie threw a joint birthday party for their children on Saturday. The "Dirrty" singer and her husband, music executive Jordan Bratman, invited 40 guests to their Beverly Hills home on Saturday to celebrate the first birthdays of their son Max Liron and Harlow Winter Kate, Nicole and Good Charlotte rocker Joel Madden's daughter.

Max was born on January 12. 2008, the day after Nicole gave birth to Harlow.