Phil Viardo confirmed the couple's split to Hollyscoop.com Sunday.
"Actor Christopher Knight and his wife, model and television star Adrianne Curry have announced ... on their five-year wedding anniversary that they are separating," Viardo's statement said. "After starting a relationship with what seemed to be irreconcilable differences, the couple has reached a period where those differences are no longer appreciated."
The decision to separate was mutual, Viardo said in the statement, adding that the announcement was made as a pre-emptive strike against rumors and gossip.
"They are taking time to see if they want to continue to put in that extraordinary effort," Viardo said. "The couple has mutually determined that they are at a place where moving forward will require a step back. They still love one another but need some distance to consider their future."
Curry and Knight met as housemates on the VH1 television series, "The Surreal Life." Their on-screen courtship led to the spin-off, "My Fair Brady," which documented their relationship from courting through their televised wedding and first year of marriage.