Did you forget your boots then? Katy Perry and Russell Brand go for a hike wearing flip-flops

So, you're hiking up a rocky embankment in the U.S. - what do you decide to wear on your feet?

For the average person a pair of hiking boots or similarly thick-soled footwear would suffice, however Russell Brand and his fiancée Katy Perry went for a somewhat impractical choice for their rocky adventure - flip-flops.

The couple took a trip to Griffith Park in Los Angeles, where they hiked up to the park's observatory.

No mean feet: Russell Brand and Katy Perry take a walk in Griffith Park, Los Angeles before embarking on a hike up to the observatory

Hike: The couple climb up the rocky hillface in their flip-flops

Both Brand, 34, and Perry, 25, had flip-flops on their feet as they trekked up the rocky incline to the observatory which offers stunning panoramic views of Los Angeles - from the Hollywood sign, to the city's downtown area and Santa Monica.

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Griffith Park Observatory opened in 1935, but it was closed for renovation in 2002.

It reopened in 2006 after a $93million facelift and continues to be a popular destination for LA residents and visitors alike because of the stunning views it offers and the serenity of its surroundings.

Meanwhile Katy recently shot scenes for a forthcoming episode of Sesame Street.

The 25-year-old first expressed her admiration for the long-running children's show last year, when she was spotted wearing a dress decorated with the show's characters.

Great view: The observatory offers stunning views of Los Angeles

Away from work Katy is busy planning her wedding to British comedian Brand.

She is said to have rejected his suggestion of a rock 'n roll wedding in favour of a church service.

As the daughter of pastor parents, she is said to be keen for her wedding to include them.

A source told the Mirror: 'Russ said she can have whatever she wants - as long as his mum's there.'

Spectacular: The Griffith observatory is pictured just after its $93million renovation