The pair, who began dating in 2008, were believed to have gone their separate ways in April. Szohr was rumored to have moved on with Sebastian Stan, the ex-boyfriend of her colleague Leighton Meester.
The reports were vehemently denied by her representative, and it seems Szohr is now back in Westwick's arms - the pair was seen flirting as they checked into a hotel in Chicago after filming together in July.
According to the New York Daily News, the pair hooked up later in the hotel's bar, with an onlooker saying, "They were taking shots. They're definitely a couple. They were kissing and holding hands."