A Nick Xenophon candidate has been fired after the ABC uncovered photos on his Facebook page appearing to show him holding his fist to a wax figure of Rihanna and groping another of Toni Collette.

Rhys Adams, SA Best's candidate for the electorate of Finniss, uploaded the photo to his Facebook page in 2015.

After discovering the photos, the ABC approached Senator Xenophon for comment and the candidate was promptly sacked, only hours after his candidacy was announced.

The photo with Rihanna is captioned "It's Chris baby" and was taken at Madame Tussauds Sydney.

Other photos show Mr Adams appearing to grope waxworks of Australian actress Toni Collette and tennis player Lleyton Hewitt.

Rhys Adams was stood down only hours after being announced as a Nick Xenophon candidate. ( Facebook )

In 2009, Rihanna was punched in the face by her then-boyfriend and fellow musician, Chris Brown.

At the time photos emerged of her with a swollen, split lip, caused when Brown attacked the singer in his car.

Brown was later convicted of assault and threatening to kill, and sentenced to five years' probation.

Xenophon 'appalled' by images

Senator Xenophon said he made the decision to end Mr Adams' candidacy after being shown the photos.

Rhys Adams with a waxwork model of Lleyton Hewitt at Madame Tussauds Sydney. ( Facebook )

"There's meant to be a process of vetting for social media [and I am] very unimpressed and quite appalled," Senator Xenophon said.

"I've spoken to Rhys Adams — he will no longer be a candidate.

"I've acted on this immediately because this is an issue that you cannot tolerate, particularly when it comes to domestic violence.

"I think this will give people an indication of how this campaign will be run ... it will be run with crystal clarity about what we want to achieve for the state and I'm not going to let something like this get in the way."

Senator Xenophon said the incident had prompted a review of his party's processes.

Senator Xenophon said Mr Adams was "embarrassed" by what had happened.

"It doesn't mean he in any way condones domestic violence," he said.

"It was a foolish thing to do … [and] he didn't do it with any malicious intent, but these are things you cannot joke about it."

University of Adelaide political commentator Jenny Stock said the case may serve as a warning to other young people running for public office.

"I think if you were vetting, you would particularly look at someone like Rhys, because he's just in that right age group to have grown up a digital native … and to have plastered everything he ever did all over social media," she said.

"Apparently it's not that hard to check.

"[This incident] says that they haven't done their homework properly."

Apology issued over 'stupid, juvenile' photos

Mr Adams had intended to run in the seat of Finniss, south of Adelaide, and told the ABC he regretted leaving the photos on his Facebook page.

"The photos you're referring to are from years ago doing stupid things with a juvenile sense of humour," he said.

"Back then I didn't take into account those that may be hurt by a what I now reflect on as a very poor taste joke which certainly doesn't reflect my mindset or my values.

"I am certainly sorry for any offence I've cause with previous Facebook posts and I wish the SA Best team the very best going forward."

Rhys Adams (far right) has been sacked over his Facebook posts. ( Supplied )

According to Mr Adams' Facebook page, he is a Victor Harbor local, a national leasing manager at Franchise Entertainment Group and a former store manager at Video Ezy.

The seat of Finniss is held by Liberal MP Michael Pengilly, who will retire at the next election.

It is not the first time Senator Xenophon has run into trouble with candidates.

State MP John Darley quit the Nick Xenophon Team (NXT) in August, describing Senator Xenophon as a "complete dictator".

NXT candidate Damian Carey was also the centre of controversy last year when it was revealed he had written a paper suggesting female genital acupuncture could cure infertility.

Senator Xenophon has announced he will run Lower House candidates in the seats of Morphett, Waite, Mawson, Finniss, Heysen and Hammond.