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Justin and Hailey Bieber aren't sitting at home reading all the chatter regarding Selena Gomez 's wedding online ... they're staying busy this weekend -- getting errands done and seemingly making big deals!

The singer-songwriter and his model wife stepped out separately Friday afternoon -- the day before Selena officially tied the knot with Benny Blanco -- with Hailey heading over for a quick trip to the DMV. Backgrid

Hailey looked stylish in a gray coat and black pants ... donning a pair of superstar sunglasses as she strode into the Santa Monica locale. Backgrid

Meanwhile, Justin was spotted outside a music studio chatting with a friend ... blue jacket on -- and, we're told he met with KISS stars Paul Stanley and Gene Simmons .

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