Mia Hewitt looked all grown up as she enjoyed a relaxing day out with a male friend last week.

The eldest daughter of tennis pro Lleyton Hewitt and his former actress wife Bec was seen out and about in Sydney‘s Surry Hills on Thursday with musician Vanda Erich.

Mia, 18, rocked a 70’s-inspired outfit – looking cool in a pair of blue wide-leg jeans, a white top layered with a blue shirt and brown leather jacket.

Her hair was styled in loose curls while sporting curtain bangs.

The teen appeared to go makeup-free for the outing and paired her look with brown boots and accessorised with silver rings on her fingers.

Meanwhile, her pal Vanda – who is the lead singer of the band Liquid Zoo – also channelled a 70’s throwback style in black trousers, a white turtleneck top and a beige corduroy jacket.

At one point, the duo were seen both looking down at a phone before heading on their way.

In January, Mia debuted her new boyfriend during a day out at North Bondi.

The pair were spotted heading into a chemist to get some sunscreen before the hitting the beach’s famous grassy knoll, a favoured spot for influencers and locals.

Mia’s outing follows reports her parents Lleyton and Bec are planning on turning their tabloid fame into TV gold.

The glamour couple was supposedly inspired by David and Victoria Beckham‘s Netflix docu-series, and hope to replicate its success with their own tell-all TV show

‘Bec is very organised and has awesome home videos, and I know in the past they’ve thought of doing something like this,’ a friend of the couple told New Idea.

‘They’ve watched Netflix‘s David Beckham series and loved it, and I’m sure it got them thinking.’

Grand slam champion Lleyton married Home And Away star Bec 18 years ago at the Sydney Opera House following a whirlwind romance.

The couple first met on the tennis court for a charity game at the Starlight Cup back in 1999, but didn’t reconnect until a few years later via text.

They finally decided to meet up in person in 2005, and became engaged after a whirlwind romance that lasted six weeks.

They share three children, daughters Mia, Ava, 12, and son Cruz, 14.