Jonathan "Jonny" Foster is a fictional character from the British ITV soap opera, Emmerdale, played by Richard Grieve. He appeared from 2007 to 2008 and in 2009. Openly gay, in 2008 Jonny enters into a civil partnership with Paul Lambert (Mathew Bose), the first of any primetime soap opera.

It was announced on 29 March 2008 that Jonny was being written out of the programme, and it was reported that Grieve had been axed by series producer Anita Turner, in addition to the axing of characters Grayson Sinclair and Perdita Hyde-Sinclair. Before this there was already reports of low morale, and the axing apparently caused friction on set. At the time Grieve said that while he had "thoroughly enjoyed the role" he thought "the time is right to move on."

In December 2008, it was announced that Jonny would be returning to Emmerdale to play a part in the departure of Paul. The actor said that he "couldn't resist this opportunity" to return to the programme.

Jonny first appears in February 2007 when he strikes up a friendly working relationship with Grayson Sinclair. Grayson's wife, Perdy, is worried that they are having an affair and invites Johnny to a dinner party with her friend, Paul Lambert. They get on and soon start dating. After six months together, Jonny moves into Victoria Cottage with Paul, Paul's father, , and Emily Kirk. He confides in Paul that, as a teenager, he suffered from an eating disorder as a result of loneliness and unhappiness. During his time in Emmerdale, Jonny sets up an aerobics dance class and fitness club.

When Rosemary King causes problems in Grayson and Perdy's marriage, leading to Perdy being sectioned, Paul spends more time with Grayson. He acts as go-between as Perdy refuses to see Grayson and this leads to Paul developing feelings for Grayson and Jonny asks Paul to marry him. Paul accepts but has a one-night stand with Grayson. When Grayson tells Paul it meant nothing to him, Paul feels guilty and tells Jonny but persuades Jonny that it was a one-off and on 3 March 2008, they get married at Hotten Registry Office. Later that day, they have a 2nd ceremony at Home Farm as neither can tell their parents they have already married.

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