Home and Away actress Pia Miller, who plays Kat Chapman in the Aussie soap, has announced her engagement.

She said yes to her partner of 18 months, Tyson Mullane, over the weekend, and shared a very heartfelt photo from the moment.

The picture, which shows Pia climbing on Tyson's back and wearing her new engagement ring, is captioned: "In a hundred lifetimes, in a hundred worlds, in any version of reality I'd find you & I'd choose you. Yes today. Yes always."

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Tyson shared his own photo from the moment, which was captured by a hidden photographer.

The picture shows Tyson down on one knee, while a shocked Pia covers her mouth - and it was simply captioned 'Si'.

Pia was previously married to former AFL player Brad Miller, but they separated in October 2015.

They have an 11-year-old-son, Lennon, together, while Pia also has a 14-year-old son named Isaiah from a previous relationship.

Tyson was previously in a relationship with model Cheyenne Tozzi.

Robbo and Kat Chapman in the aftermath of their explosion drama in Home and Awaypinterest
Channel 5

Pia's character is also facing big changes at the moment, as Kat is set to receive a surprise proposal after discovering that she's expecting a baby.

When she tells the baby's father, Robbo, about the pregnancy, he decides to propose to Kat.

The scenes won't be screened by Channel 5 in the UK until January, due to the upcoming six-week Christmas break coming up for Home and Away.

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