Hutchison, meanwhile, split just recently from former Home and Away actor Jason Smith.
A TV insider confirmed the relationship had lasted several years. "As far as I know she is single and enjoying the single life."
But since then, said another source, Hutchison had been in high spirits on the set of Go Girls. "She was just the happiest person in the whole world."
Hutchison flew to Los Angeles last week to view a screening of her new horror movie Cabin In The Woods.
But first, she Tweeted her support of Richie.
"Look who showed up to the @gogirlsnz trailer!" she wrote. "Yay 100 games @RichieHMcCaw."
She told the Sunday Telegraph this year that she was a bit of a "tomboy" in real life.
"I like the footy and sports. I am more comfortable in running gear than I am in heels, because I usually trip up in them."