She has been booked once again for a radio advert promoting the centre which received a £440m revamp in 2017 with a rooftop terrace and restaurants and 100 new shops added.
The 79-year-old actress is perhaps best known for her role as Patsy Stone in the BBC sitcom Absolutely Fabulous, for which she has won two BAFTA TV Awards.
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She has also starred in Martin Scorsese’s 2013 hit The Wolf of Wall Street, the 1969 James Bond film On Her Majesty’s Secret Service, and The New Avengers, among others.
Recent additions at the Westgate centre include beauty care giant Sephora.
Popular lifestyle brand Oliver Bonas has moved to a new larger unit.
Hundreds of shoppers queued up last month on Sephora’s opening day to get their hands on some beauty product bargains.
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The owners of the shopping centre have also been promoting its stores on big screens at Piccadilly in London.
Westgate Oxford being advertised at Piccadilly Circus (Image: Westgate Oxford)
Dame Joanna has a number of links to Oxfordshire.
She was awarded an Honorary Doctor of Letters by Oxford Brookes University in 2002.
She also backed The Old Bakehouse in Chadlington, leading to a community group stepping in to save the supported living home from closure.
The actress recently revealed that she and her husband, Stephen Barlow, have discussed funeral arrangements.
In her interview with Hello! mag, the actress said: “One’s conscious of growing older.
“And therefore I’ve got a lovely piece by Samuel Johnson, written in 1770, saying: ‘I’m an old man now, so hope I get through the year and granted the grace to behave properly.’
“It’s that general feeling that life goes by, good or bad, and no matter how old or young we are, we’re all going to die, so be ready for it.”