It's probably not the wisest thing to do after working up a sweat.

But pop star Rihanna seemed extremely relaxed after puffing on a suspicious hand-rolled cigarette following a rigorous exercise session this weekend.

The brown papered roll-up looked remarkably similar to a 'blunt', which is slang for a marijuana filled cigar. The type favoured and popularised in hip-hop music.

While some people undoubtedly just smoke cigarettes, Rihanna did look rather laidback as she lolled on her sunlounger.

Rihanna looked blissful and deep in thought while taking a private moment for herself.

The singer has been quite vocal on her Twitter page recently, telling fans how she has been enjoying her time off.

On Sunday she tweeted a message saying: 'Kush rolled, glass full...I prefer the better things.'

The line refers to a lyric taken from Drake's song, Up All Night, where the rapper talks about smoking cigarettes marijuana.

Earlier on in the week the Rihanna tweeted: '4:20...Hi.' The figure 4.20 is another slang term for marijuana.

The 23-year-old Umbrella singer was enjoying the Hawaiian sunshine on Sunday.

Her face free of make-up, she looked totally at ease wearing black leggings and a hot pink vest top.

The barefoot singer sat on a sun lounger and puffed away before lying back and taking in the scenery.

It's been a relaxing few weeks for the singer from Barbados.

She jetted into Hawaii at the weekend after spending a few days in Los Angeles, where she was seen sitting court side at a couple of basketball games.

Two weeks ago the Good Girl Gone Bad welcomed the New Year in Miami with P Diddy.

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