The on-and-off proved their relationship is back by welcoming 2016 at a USD 4,500 property in Malibu, which they rented from Airbnb, reported the New York Post.
Roberts, 24, tweeted, "Perfect way to start 2016."
The pair apparently made no attempt to hide their affection one another and were seen strolling hand-in-hand on the beach, as well as visiting the Malibu Country Mart and a local Starbucks.
Peters, 28, fuelled speculation the couple had reconciled back in October when he gushed about the "Scream Queens" star.
The actor began dating Roberts in 2012 and proposed to her in December 2013.
Their engagement came to a crashing halt last summer and it was claimed the split was "amicable".
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