Diana, 73, wore a flowing empire-line gown with plunging neckline along with some platform wedge sandals.
The character has been featured in various media adaptations, such as feature films, television series and video games.
Diana Ross was beaming with pride as she saw her eldest son get married on Saturday.
The soul diva was dressed in white as she she joined family and friends for her 29-year-old son Ross Naess' wedding to Kimberly Ryan at Rancho Dos Pueblos in Goleta, California.
Two-Face has been voiced by Richard Moll in DC animated universe, Troy Baker in the Batman: Arkham series, Billy Dee Williams in The Lego Batman Movie, and William Shatner in Batman: The Caped Crusaders vs. His live-action portrayals include Billy Dee Williams and Tommy Lee Jones in the Batman film series, Aaron Eckhart in The Dark Knight, and Nicholas D'Agosto in the television series Gotham.
In 2009, Two-Face was ranked #12 on IGN's list of the Top 100 Comic Book Villains of All Time.