Credit: Jason Laveris/

Sophia Bush isn't ready to become Mrs. Austin Nichols -- at least not yet, anyway.

The One Tree Hill actress is slamming a Star magazine report that she's accepted an engagement ring from her on-and-off beau of four years.

"Must be a slow week in the gossip world," Bush, 28, tweeted Thursday. "Sorry y'all, we're not engaged! Shooting a TV wedding, not a real one!"

Not that the actress, who divorced her former One Tree Hill costar Chad Michael Murray in 2006, hasn't at least considered the idea of getting married again.

"We had so much history before he came to North Carolina," Bush told in July of Nichols, 30. "Someone uprooting their life and moving across the country for you, it's pretty much the modern-day knight in shining armor."