But now Bush has opened up about the romance, admitting she and her beau actually started dating in 2006 - two years before Nichols even started working on the TV drama.
And the star is smitten with the actor, who took a job on One Tree Hill in 2008 and moved to be closer to her.
In what could even be mistaken for a plot from the hit US drama, One Tree Hill actress Sophia Bush has revealed she is dating her co-star Austin Nichols.
The actress, who divorced fellow One Tree Hill star Chad Michael Murray in 2005, has actually been in a relationship with Austin for four years - two years before he even started work on the show!
After six years of on and off dating, Sophia decided it was time to split for good.
How many girls can say they hooked up with a wrapped, she made her return to the big screen.She is known for her film roles in John Tucker Must Die (2006), The Hitcher (2007), and The Narrows (2008). At Westridge, she was required to participate in the theatre arts program.Since 2014, she has starred in the NBC police procedural drama series Chicago P. Bush stated: "Part of my school's requirement was to do a play.Taking to Twitter, the Gladiator star labelled the claims as 'deliberate lies'.In their story on Monday, the publication claimed that Sophia had met Russell's two young sons, Charlie, 13, and Tennyson, 10, who he shares with ex Danielle Spencer, 48, and has the tick of approval from his boys.'She has a wonderful exuberance and is a lot of fun, but she's also really down-to-earth and has a direction in life, which he likes,' a 'friend' reportedly told the magazine.