The real reason why Bindi Irwin skipped the annual Steve Irwin Gala for the second year in a row

Terri Irwin and son Robert Irwin have revealed why Bindi Irwin missed the third annual Steve Irwin Gala again this year.

The duo were all smiles as they hit the red carpet for the event in Las Vegas on Saturday evening when they revealed Bindi, 27, is lying low and recuperating amid her battle with endometriosis.

The Wildlife Warrior and mother-of-one, who is married to American former wakeboarder Chandler Powell, 29, also missed the gala event last year due to a ruptured appendix.

Speaking to E! News at the event, Terri, 61, explained Bindi wasn't going to be attending.

"This year she's just staying a little close to home," she explained.

"So, things like a lot of travel are a bit challenging for her at the moment and so she'll be here next year to celebrate this wonderful night.

"Bindi is doing so much better now."

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Robert added this his sister is "holding down the fort" back home at Australia Zoo in Queensland.

At the gala, Terri and Robert ditched the khaki for their red carpet best.

The Irwin matriarch turned heads in a colourful floral dress, while Robert, 22, looked dapper in a sharp black suit and tie.

They were joined at the gala event by American actress Danielle Fishel, 44, best known for the iconic show Boy Meets World.

Robert shared a post following the gala, writing: "Last night's Steve Irwin Gala was a huge success raising vital funds and awareness for the charity my Mum and Dad started.

"It was a room full of friends and family gathering together to celebrate the life and legacy of my Dad. His passion, and message lives on. Thank you to everyone who joined us last night to support @wildlifewarriorsworldwide," he wrote.

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In March, Bindi shared a candid post amid her battle with endometriosis, telling fans she's had 50 lesions removed and even a chocolate cyst, which is a fluid-filled sac removed.

It was for Endometriosis Awareness month.

"An appendectomy and a hernia repair," she said she also had.

"I've felt indescribable, inescapable pain. Trying to keep my invisible illness to myself after being told by doctors it was just "part of being a woman." I spent 10 years being undiagnosed.

"No one deserves to suffer in silence... If you're in pain, my heart breaks for you. I believe you. Please find answers. And don't give up on yourself. I know how hard that can be."

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