After a rousing 3-2 win over Everton last weekend, Newcastle travelled down to the South Coast on Saturday afternoon to take on Bournemouth at the Vitality Stadium.
Newcastle took the lead through a superb Salomon Rondon free kick, but two second half goals from Josh King – one from the penalty spot – put Bournemouth on the verge of a win.
However, there was a late twist in the tale as DeAndre Yedlin's cross was exquisitely volleyed into the roof of the net by winger Ritchie.
The 29-year-old spent three-and-a-half years with Bournemouth before moving on to Newcastle in 2016, but that didn't stop him celebrating against the Cherries.
Ritchie celebrated with the traveling Newcastle fans, who spilled onto the pitch as there were wild scenes following the injury time equaliser.
Celebrating against a former club is sometimes seen as a show of disrespect, but pundit Redknapp has defended Ritchie, feeling that there should be no problem with him sharing the moment with Newcastle fans, and took a small pop at Fulham's Ryan Babel for not celebrating against Liverpool less than 24 hours later.
"I have no problem with Matt Ritchie celebrating his goal at Bournemouth," said Redknapp. "He may have spent four successful seasons on the south coast but his only focus now is securing Newcastle’s Premier League status. It is right that he should want to celebrate with the fans who had made the 350-mile trip down. I’d rather that than Ryan Babel’s non-celebration for Fulham against former club Liverpool!" he added.