Stars gathered  at the annual Cartier biggest watch launch party of the year in San Francisco, California. Celebration marked the launch of the 2018 Santos de Cartier collection of watches.

The party, at Pier 48 in San Francisco, was hosted by Cartier North America president and CEO Mercedes Abramo and international marketing and communications director Arnaud Carrez.

The Santos name dates back to one of the world’s first wristwatches, which was designed by Louis Cartier in the early 20th century for his friend Alberto Santos-Dumont, a fearless Brazilian airman and inventor. The 2018 family is bang up-to-date with its 1847 MC automatic calibre using anti-magnetic nickel phosphorus components in the escapement and movement mechanisms, as well as a shield made from a paramagnetic alloy to prevent interference from magnetic fields.

The watch, which will hit stores this month, sticks closely to historic designs. Its square case with rounded corners and lugs that sweep into the strap are familiar, as are the eight screws on the bezel and the roman numeral hours behind Cartier blue hands.

Stars attending the San Francisto party included Mercedes Abramo, President & CEO Cartier North America; Arnaud Carrez, International Marketing and Communication Director; Jake Gyllenhaal, Sofia Coppola, Annabelle Wallis, Bianca Brandolini, Melanie Laurent, Niels Schneider,  Idris Elba, Phoenix, Sienna Miller, Freida Pinto, Lily Collins, Chloe Sevigny, Sofia Boutella, Lisa Bonet, Courtney Eaton, Yasmine Sabri, Winnie Harlow, Edgar Ramirez, Jeremy Renner, Dave Franco, Aaron Paul, Jason Momoa, Laird Hamilton, Miguel Angel Silvestre, Henry Golding, Deng Chao, Ma Yansong, Shota Matsuda, Simi and Haze Khadra, Prin Suparat, Trystan Pütter, Volker Bruch, Maxi Iglesias, Yoo Ah-In, Ali Mostafa, Anne Waterman Bassin, Caroline Issa, Charlie Spalding, Elizabeth Von Guttman, Vanessa Getty, Alexis Traina, Todd Traina, Trevor Traina, Victoria Traina Emilie Spalding, Katie Paige Schwab, Katya Sorokko, Lauren Goodman, Mary Gonsalves Kinney, Olya Dzilikhova, Juliet Belkin, Ruzwana Bashir, Sabrina Buell, Sonya Molodetskaya, Tatiana Sorokko, Tatum Getty, Timo Weiland, Yves Behar, Liev Schreiber, Nas, Kelly Sawyer, Sam & Aaron Taylor Johnson, Derek Blasberg, Leila Nda, Juan Pablo Jim, Eric Buterbaugh.