Demi Lovato and former-beau Wilmer Valderrama reportedly enjoyed one-on-one time this past weekend at Knott's Berry Farm Halloween Haunt in Buena Park, Calif., where they participated in Halloween Festivities.

The on-again, off-again pair was also spotted together in August, when the two made a trip to Disneyland in lieu of attending the MTV Music Video. And, later in the month, the two were seen shopping in Beverly Hills at Barneys department store.

The hush-hush couple was photographed on the Xcelerator and Ghostrider roller coasters, walking the Dominion of the Damned scary maze, and exploring the farm until they left at the closing time of 2a.m., after arriving at 10p.m. The entire stay, the 21-year-old singer remained incognito, wearing all black and cloaked with a hood. Valderrama, 33, wore a simple black t-shirt and jeans. This reunion is the first of many since the two split in January 2012, due to issues that arose because of their age differences.

The farm visit comes just a few weeks after Australian DJ Ruby Rose claimed that she and Demi Lovato slept together, which the DJ attempted to confirm by posting exchanges between the two on social media outlets, Instagram and Twitter. She also made bold statements such as "I'm like the one person demi has slept with that didn't sell on naked photos of her so eff off @rogoldbe," and "Think i'll take a few days off social media while @ddlovato's friends attack me for being a 'scorned ex-lover'. get over it!! I liked the hair."

Lovato has not issued a comment in response to the DJ, nor has she confirmed that she and Valderrama are an item.