On Sunday, the British actor was pictured arriving at Kristen's Los Angeles home — the last time he was pictured there was on 19 May, when he was seen moving his possessions out of the house.
The 27-year-old star was spotted parking his pickup truck outside the Los Feliz residence, wearing a black baseball cap and dark sunglasses to disguise his identity.
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Robert and Kristen, 23, dated for four years before splitting in May this year. They decided to go their separate ways when Robert struggled to get over Kristen's affair with married Snow White and the Huntsman director, Rupert Sanders.
But the couple have reportedly been spending time together since 1 August, despite rumours that the actor is dating the granddaughter of Elvis Presley, Riley Keough.
"She's the first girl he's liked since Kristen," a source said of the 24-year-old American actress told US Weekly.
"[They're] having a lot of fun," they added.
The red-headed beauty, who appeared with Kristen in the 2010 drama The Runaways, was previously engaged to English actor Alex Pettyfer after meeting him on the set of their movie Magic Mike.
Since the Twilight stars’ split, Kristen has kept herself busy filming Camp X Ray while Robert has been spending time with an array of young women including close friend Katy Perry and playwright Polly Stenham, who both laughed off rumours of potential romances with the British actor.
In an interview for the September Issue of UK Elle, Katy Perry silenced reports of a budding relationship between the pair.
“He's my bud, I'm like his big sister,” she revealed.
She also revealed she had texted Kristen to set the record straight.
'I sent her a text message saying: "I know you've seen all this stuff, but you know I would never disrespect you. I'm not that person,"' she said.