Mariah Carey dropped in on Instagram Monday to share a new post with her following of 11.5 million.The 52-year-old songstress cozied up to boyfriend Bryan Tanaka, 39, and her kids Moroccan and Monroe, 11, who she shares with ex-husband Nick Cannon.The Grammy-winning music artist wrote in her caption: 'Happy Boxing Day!' New! Mariah Carey dropped in on Instagram Monday to share a new post with her following of 11.5 millionThe longtime entertainer added in parenthesis, 'Every day is a celebration!'The three-image carousel opened with a snapshot of the Queen of Christmas smiling cheek-to-cheek with Bryan, who she's been dating since 2016. The Glitter actress flashed a bit of cleavage as she leaned on a table in a strapless, plaid patterned dress.She kept her shoulders warm as she covered them with a chunky black cable knit sweater. Mariah wore her sleek honey-blonde hair in an updo with a tastefully towering fountain ponytail.Her glossy bangs were sideswept and her locks fell over her shoulders and chest in immaculate curls.Bryan, also an entertainer, looked handsome in a textured black turtleneck and his dark hair was slicked back.He sported a goatee as he smiled alongside his lady love, who flashed a bangle of diamonds on her wrist.