Olivia Williams has offered details about her guest starring role on Friends that she previously described as 'harrowing'.

The 53-year-old British actress recently told The Independent about her experience portraying Felicity on the season four finale of the NBC sitcom and what made it distressing.

'Gosh. Well, just as an example, I was taken to the studio in a shared car with a wonderful actress whose character, I think, was called ''Old Woman'',' Olivia said.

Olivia recalled that the older actor was 'very good' and 'distinguished', yet was still singled out for firing.

'At one point, a producer – who shall remain nameless – just yelled at her: ‘You’re not funny!'',' Olivia said with a theatrical gasp.

Olivia Williams, shown in February in Berlin, has offered details about her guest starring role on Friends that she previously described as 'harrowing'

'And she didn’t come back the next day. So that was alarming,' Olivia added.

Olivia also noted that Friends was a 'brand' that she had to fit.

'You go into hair and make-up and you’re told, ‘There’s a look here, this is what we do.’ And that involved, essentially, plucking off all of your eyebrows,' Olivia said.

She recalled trying to save her eyebrows in case she needed them for another job.

'But yes, that’s the sense in which it was harrowing,' Olivia said.

The North London native was featured in the season four finale of Friends in which the main characters traveled to London for the wedding of Ross and Emily. Olivia portrayed one of Emily's bridesmaids.

The wedding famously showed Ross accidentally saying Rachel's name during his vows.

Olivia recently portrayed Camilla Parker Bowles on seasons five and six of The Crown.

The 53-year-old British actress recently told The Independent about her experience portraying Felicity on the season four finale of the NBC sitcom and what made it distressing

The North London native was featured in the season four finale of Friends in which the main characters traveled to London for the wedding of Ross and Emily

Olivia portrayed one of Emily's bridesmaids in the wedding episode that famously showed Ross accidentally saying Rachel's name during his vows

The North London native, shown in February in Los Angeles, recently portrayed Camilla Parker Bowles on seasons five and six of The Crown

She will next play Tula Harkonnen in the upcoming Max series Dune: Prophecy.

Dune: Prophecy is based on the novel Sisterhood of Dune by Brian Herbert and Kevin J. Anderson and is part of the Dune universe created by Frank Herbert.

Olivia made her film debut in the 1997 movie The Postman that starred Kevin Costner, who also produced and directed.

She also played the wife of Bruce Willis' character in the 1999 film The Sixth Sense.