Danny, who plays Mick Carter in the soap, and Joanne also have two older daughters, Dani, 18, and Sunnie, seven.
Danny and Joanne's choice of people to oversee their son's spiritual upbringing has raised some eyebrows, as neither Kirk nor Tracy have particularly saintly pasts.
Kirk, 26, had to apologise last year after explicit sexual images emerged online.
Former Page 3 model, Tracy, 48, spent two years in Holloway Prison after being caught unknowingly smuggling money for an international drugs ring in 1998.
Danny's close pal Jonathan Sothcott, who produced new film We Still Kill The Old Way starring Danny's eldest daughter Dani, was one of the guests at the christening.
Speaking on the Weekend Hangover Show on Fubar Radio Jonathan said: "It was lovely, there were a group of us there, most of the Carter family were there from EastEnders.
"Kirk Norcross is a great guy and he is godfather. He is a lovely fella. Tracy Kirby is the godmother. She was a famous Page 3 girl in the 80s.".
Jonathan added that Arty will be very well-protected. He said: "He's got no worries. He is definitely on the firm."
More on Parentdish