The co-stars dated for three years while on their popular TV series.
The actress says she was good friends with the Oscar winner in high school.
The two went public in January after being seen together over the holidays.
The former couple dated on-and-off during the run of their teen soap.
From surprise pairs making their debut to longtime loves that stay under the radar, here's some of our favorite couples on the carpet.
Bill Hader and Rachel Bilson seemingly confirm their relationship at the 77th Annual Golden Globe Awards.
The new couple sparked speculation after grabbing coffee together over the holidays.
The pair co-starred in the 2013 movie, 'The To Do List.'
The former 'Bachelor' is singing Bilson's praises.
A source tells ET that Viall finds Bilson 'smart, fun and attractive.'
ET spoke with the actor at the premiere of 'Ready or Not,' in theaters Aug. 21.
The actor opened up to ET at the red carpet premiere of his new horror comedy, 'Ready Or Not,' on Monday.
The actress also touched on a 'Hart of Dixie' revival, her new Celebreaks campaign and more.
Seth and Summer have reunited!
