'Who?' Paris Hilton awkwardly shuts down a question about her 2003 fling with Rob Mills... after he claimed they kept in touch for a YEAR after hook-up

By Jo Scrimshire For Daily Mail Australia

Published: 10:08 GMT, 17 November 2016 | Updated: 11:48 GMT, 17 November 2016

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Paris Hilton blanked a question about her former fling Rob Mills during an interview on The Project on Thursday.

The 35-year-old looked awkward when guest host Ryan 'Fitzy' Fitzgerald brought up her brief romance with the Australian Idol star.

'Who?' the American socialite responded bluntly, before the segment was quickly wrapped up by TV producers.

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'Who?' Paris Hilton (L) blanked a question about her former fling Rob Mills (R) during an interview on The Project on Thursday

Near the end of the interview, Fitzy asked if she was in a relationship, and Paris replied: 'I'm very single.'

But when he brought up her fling with 'Millsy', things took a rather unfortunate turn.

'This is an old flame, but do you still keep in contact with Millsy? Robert Mills? Remember Millsy?' he asked.

'Who?' said Paris, shaking her head, 'No'.

Not an approved question? Paris looked awkward when guest host Ryan 'Fitzy' Fitzgerald brought up her brief romance with Rob. Pictured with host Peter Helliar (R)

'Do you still keep in contact with Millsy?' When Fitzy brought up Paris' fling from 13 years ago, things took a rather unfortunate turn

'We're running out of time, Fitz': Meanwhile, The Project host Carrie Bickmore (R) desperately tried to wrap up the segment. Pictured with host Waleed Aly

Meanwhile, host Carrie Bickmore desperately tried to wrap up the segment, saying: 'We're running out of time, Fitz.'

Amusingly, The Project's closing credits music began playing the moment Fitzy asked the question.

Paris had a brief relationship with Rob shortly after he rose to fame on the first series of Australian Idol in 2003.

Memorable? Paris' sudden memory loss may come as a surprise to Rob, who recently said he kept in touch with the US socialite for a year after their Melbourne Cup hook-up

But her sudden memory loss may come as a surprise to the Neighbours star.

Last month, Rob said he kept in touch with Paris for a year after their fling during an appearance on 2Day FM's Rove And Sam.

'For about a year we did and then that was it. We caught up the next time she was (in Australia),' the 34-year-old said.

What a transformation! In the last 13 years, Rob has reinvented himself from reality TV larrikin to respected musical theatre star and TV actor. Pictured in 2014

They first met at an event at Sydney Opera House before heading to an after-party hosted by Osher Günsberg.

Afterwards, they spent the night at Paris's hotel before meeting up again shortly after the Melbourne Cup.

'We did pretty much everything but (sex) and then we caught up at the races a week after,' he told The Sydney Morning Herald.

'We did pretty much everything but': Paris and Rob first met at an event at Sydney Opera House before heading to an after-party hosted by Osher Günsberg