Bec and Lleyton Hewitt's rocker daughter Mia, 18, shows off her new tattoos as she enjoys a day at the beach in Sydney

Bec and Lleyton Hewitt's daughter Mia was enjoying some fun in the sun on Wednesday.

The indie rocker, 18, was joined by a gal pal as they happily soaked up some rays beachside on a sunny Sydney day.

Mia opted for a mismatched bikini for her day at Gordon's Bay, wearing a turquoise coloured top and a pair of orange and black floral patterned bottoms.

She also wore a pair of brown tinted sunglasses perched on top of her head and a pair of white lacy pants.

She accessorised with a large red and white striped beach bag and a pair of navy blue sandals that she carried in her hands.

Mia was also flaunting a range of what appeared to be new tattoos as she worked on her tan.

Her left forearm now bears an array of artwork, including a heart design, four cryptic symbols, and what appeared to be a short sentence, written in cursive.

Mia's left bicep also featured some new ink, including a barbed wire design underneath a classic arrow piercing a love heart.

The heart appeared to contain the name 'Tiarne'.

Mia also appeared to be sporting another tattoo above her right knee.

She appeared to be very much in relaxation mode, lazing on a towel that was draped over a large rock.

She happily sat next to her gal pal as the pair took in the scene.

While it is unclear when Mia acquired the new ink, she appeared tattoo-free back in September when she was spotted on another beach date with rocker boyfriend Vanda Eric.

Also when Mia was snapped in Sydney's inner-west prior to her band Father's Favourite in October, she was similarly ink free.

Mia's band, a duo with friend Cherise Combrink, performed their first gig back in August .

And with Mia stepping into the musical spotlight, her former Home and Away star mum Bec is reportedly keen to steer her in the right musical direction.

While she is best known for playing Home and Away fan favourite Hailey Smith Lawson from 1998 to 2005, the actress also had a brief pop career.

On the back of her television fame, Bec released an eponymous solo album in 2002 and her debut single All Seats Taken hit number 10 on the ARIA chart.

Her album however was met with mixed reviews and her music career effectively came to an end in 2004 when she parted ways with label Warner Music.

A source told New Idea recently that Bec is keen to ensure that her daughter avoids the pitfalls that can befall new and inexperienced artists.

'Bec knows how to deal with bad people, dodgy managers, and doesn't want Mia making some of the mistakes she made early in her career like being too optimistic about certain jobs,' the source said.

They added that while music is Mia's current consuming passion, she hasn't ruled out a career in front of the camera, like her actress mum.

'Mia is very savvy. She knows you can't just be good at one thing and that entering the music industry will ultimately see her having to create social media content and putting herself forward,' they said.

'Ultimately that can lead to more work like modelling, acting and even presenting.

'Bec just wants Mia to be happy and working on a career that is going to sustain her.'