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Selena Gomez, Justin Bieber, Twitter

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These reunited lovers can't seem to keep their paws off each other.

It looks like Selena Gomez and currently on-again boyfriend Justin Bieber enjoyed some sweet time together over the weekend. E! News has learned that the famous Hollywood pair went to Lucky Strike in Los Angeles on Sunday night to celebrate pal Ryan Butler's birthday—and these two weren't shy about flaunting some serious PDA.

"Justin rented out Lucky Strike's Luxe room for the celebration. Additionally, he was seen kissing and flirting with his on-and-off again girlfriend, Selena Gomez," a source tells E! News. "The group, of about 12 people in all, enjoyed some of Lucky Strike's Esteban's Nacho's Grande, Cheeseburgers and wings. Specifically, Justin was seen eating the Mac & Cheese bites."

Gomez and Bieber each opted to keep any evidence of their bowling date away from their social media accounts, with Selena only posting about her new bangs and Justin keeping it to a short and sweet birthday wish.

"Happy bday butsy. Love you buddy," he tweeted.

However, Butler's girlfriend posted a cute snapshot of her beau enjoying a sweet treat, with Bieber laughing in the background and Selena giving him an adoring gaze. "The happiest I've seen him in a while.. ," she wrote.

—Reporting by Michelle Falls

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