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Taylor Swift was right by Travis Kelce 's side as he toasted his new venture -- the soft opening of his steakhouse, which he co-owns with Patrick Mahomes -- turning the night into a celebration of both business and love.

Sources with direct knowledge tell TMZ ... the couple arrived hand in hand to 1587 Prime Steakhouse around 6:15 PM Monday, making their way up the grand staircase before greeting family and friends. Once inside, they tucked into a semi-private corner booth, where things stayed low-key but affectionate. 1587 Prime Steakhouse

Taylor wore in a blue denim mid-thigh dress paired with wedges, her hair swept to the side, while Travis kept it casual in a green striped shirt and cap. We're told the two acted like any normal couple -- laughing with hi

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