Leonardo Dicaprio helped organise Rihanna's birthday party.

The 'FourFiveSeconds' hitmaker celebrated her 27th birthday on Friday (20.02.15) night with a bunch of celebrities and her new rumoured boyfriend reportedly made sure it was a night to remember.

The party - which took place at a home in Beverly Hills - was personally decorated for the 'Diamonds' hitmaker, who celebrated the milestone alongside Naomi Campbell, Mick Jagger and Beyonce as well as Jay Z and Jim Carrey.

A source told Us Weekly: ''There were balloons that spelled out her name set up.''

And Rihanna got to blow out her 27 candles on top of a three-tiered cake decorated with leopard print as her celebrity pals watched on.

The rumoured couple were also believed to be ''dancing close all night''.

Meanwhile, Rihanna has reportedly put her rumoured lover on a diet.

A source said previously: ''Ri's got extremely high standards when it comes to who she sleeps with and Leo falls out of this category because he's a lot more flabbier than her usual lovers.

''Leo thinks it's all highly amusing. He's never had a girl tell him what to do, so you can imagine how much he's loving it. She wants him to get a six-pack.''