Zac Efron’s heartbreak, Nick Cannon defending Mariah Carey: Your weekly US round-up

Zac Efron is 'still not over Vanessa Hudgens'

We're still not quite over their break-up, and apparently Zac Efron is still pining for his first love Vanessa Hudges.

The 26-year-old actor and Vanessa, 25, met while filming High School Musical in 2006, and dated from then up until 2010.

According to sources, despite the fact Zac receives a lot of female attention 'he can't get over Vanessa'.

"Zac still longs for Vanessa and bitterly regrets letting her slip through his fingers," a source told Radar Online.

It is thought that Zac's partying lifestyle caused major problems in his relationship with Vanessa. In 2013 he was admitted to rehab over alcohol and substance abuse issues.

The source added: "Zac still finds it hard accepting Vanessa is gone, to the point where he spends hours talking to her, looking at old pictures and generally moping about what they used to have together."

Come on guys, can't you just get back together already?

Nick Cannon defends estranged wife Mariah Carey's 'vocal problems'

Nick Cannon seems to have put his problems with Mariah Carey to one side and leapt to her defence.

Mariah, 44, came under fire after a video emerged showing her appearing to have vocal issues during a concert in Japan.

But 33-year-old presenter Nick has rubbished the claims she is 'losing her voice'.

He told a US radio show: "You know you might have an off night here and there, but she's one of the greatest performers and entertainers of all time, she's not worried, we're not worried, just going to keep pushing."

It was recently revealed that Nick has begun the process of having the tattoo of Mariah's name on his back covered but, despite this, he says that they're in 'constant touch'.

He continued: "I just wish her nothing but the best, we're in contact constantly."

The reason for this is obviously their six-year-old twins, son Moroccan and daughter Monroe. Of them, he said: "They're doing amazing, they're on the road right now with mommy on tour so they're having a good time. It's all love, man."

We're glad to see their split is going amicably!

From squeaky-clean pop star to sleek and stylish superstar: Rihanna's transformation

It's been reported that Rihanna is gearing up to release her EIGHTH studio album which, when you consider she's only 26, is no mean feat.

Since bursting onto the music scene in 2005 with her radio friendly debut single Pon De Replay, she's undergone a major transformation.

Gone is the innocent 15-year-old who nervously left her home country of Barbados to audition in front on none other than Jay Z, and in her place is a fearless and extremely successful woman.

Over the last nine years Rihanna's style has evolved and she's now something of an icon in the fashion industry. As well as launching a collection through high street giant River Island, she also fronted the show Styled To Rock, which searched for the next big fashion designer.

Check out her fashion through the years. What was your favourite look of hers?