The couple, who have kept their four-year-long relationship going despite Eugenie's move to New York, were thrilled to be spending time together at Tracey Emin's birthday party in London.
Eugenie and Jack joined celebrity guests including Eva Herzigová, Tinie Tempah, Joan Collins, Nancy Dell'Olio and David Furnish at Mark's Club in Mayfair for the bash.
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The duo, who rarely pose for photos together, cuddled up for numerous pictures before heading on to Loulou's private members club to join Eugenie's mum Sarah, Duchess of York.
Eugenie, 24, sported a patterned black, white and blue dress and black heels for the evening while Jack looked dapper in a navy suit.
Also celebrating artist Tracey's special day were Gloria Hunniford, Janet Street-Porter, Lizzie Cundy, Vivienne Westwood and Star Wars actress Carrie Fisher.
The birthday girl, who turned 51 on Thursday, blew out the candles on a large yellow cake adorned with pink frosting and roses.