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She completed the ensemble with a pair of comfortable black sneakers and tied her long hair in a high ponytail.
The mother of two went makeup free as she pushed her daughters in a pram.
Stunning! The 29-year-old personal trainer's sparkler was the main focus as she glanced at her phone during the outing
The outing comes just two weeks after her longtime partner Kris proposed.
The pair were celebrating their daughter Frankie's first birthday with a party in their backyard when Kris asked for Sarah's hand in marriage.
He captioned a gallery of charming photos on Instagram: '2020 wasn't all bad... she said yes.'