The second ex-wife of Peter Cook has issued a written apology to his first wife — supermodel Christie Brinkley — for ignoring her warning about the architect’s philandering. 
 
 “Christie and I have talked recently and I have privately apologized to her, but, given the public nature of their divorce and custody battle, I feel a public apology is also appropriate and deserved,” Suzanne Shaw wrote in a letter obtained by The Post Thursday. 
 
 Shaw said she was sorry for bad-mouthing the model by saying in 2012 that “it was the black cloud of Christie Brinkley’s hate” that had tainted Shaw’s marriage to Cook — when he had actually been continuing his skirt-chasing ways. 
 
 “Christie was wrongly vilified as being an embittered ex-wife,” Shaw wrote. “I now believe she had every right to do what she did by taking a public stand; she was only trying to protect her children and have the truth be told. Given the nature of Peter’s behavior, and battles for sole custody of their children, it was necessary for her to confront him publicly.” 
 
 Christie’s six-year marriage to Cook imploded in 2007 after she learned of his affair with 18-year-old office clerk Diana Bianchi. Cook rebounded by getting hitched to Shaw, who stood by his side during his ongoing court battles with Brink­­ley. During a 2012 hearing, Brinkley tried to warn Shaw about Cook’s infidelity. 
 
 “When you find out he’s been cheating on you, I’ll be here for you,” Brink­ley said in a courthouse hallway. 
 
 “Come up with a new line!” Shaw barked back. It turned out Brink­ley was right, and Shaw split with Cook this year, accusing him of cheating. 
 
 “What I say here is by my own volition. I truly feel it’s simply the right thing to do. I’m deeply sorry for my part in causing Christie any unnecessary pain,” Shaw writes. 
 
 “Unfortunately, I fell under Peter’s spell, but now that the reality of who he is has been revealed, I regret my involvement. Christie is a wonderful mother and community member who involves herself in charitable causes and has truly made a contribution to society.” 
 
 “Last week, Christie said, ‘I wish you the courage to do the right thing for yourself, your daughter and countless women suffering at the hand of an extreme narcissist.’ I believe I have done this now. I thank Christie for forgiving me and I wish her only the best. 
 
 “I would like to move on with my life now, quietly and privately. Peter and I have filed for divorce. I am putting this behind me.” ||||| Once a cheater, always a cheater! 
 
 Eight years after his severely bitter split from Christie Brinkley and their subsequent financial and custody battle, the model’s 
 
 unfaithful ex husband, Peter Cook, has legally separated from his wife, Suzanne Shaw— and sources tell the New York Post’s Page Six that his infidelities are to blame. 
 
 PHOTOS: Cheaters Gallery 
 
 “Suzanne stood by Peter for years, through all his battles with Christie, but he lied to her and completely misrepresented himself. She repeatedly caught him cheating,” an insider told the paper. 
 
 Shaw, who was wed to Cook, 55, for more than six years, left their Hamptons home in February with her teenage daughter after filing for separation. 
 
 PHOTOS: Celebs Who Have Been Divorced Twice Before 40 
 
 Cook’s lawyer, John J. Fellin, denies his client cheated. 
 
 “The separation agreement does not mention, in any way, infidelity by Mr. Cook, and any such allegations to that end are without merit,” he told The Post. 
 
 PHOTOS: Don’t Get Mad, Get Everything! Inside The 16 Most Expensive Celebrity Divorces Of All Time 
 
 Brinkley, 60, and Cook are still at each other’s throats years after they split amid allegations he cheated with his 18-year-old assistant, Diana Bianchi. The National ENQUIRER recently reported that the pair has been battling over custody issues with their 16-year-old daughter, Sailor. 
 
 “The sad reality is, almost eight years later, Christie is still mired in our divorce and hatred of me which has been irreparably damaging to our children,” Cook recently told RadarOnline.com.
– Christie Brinkley's marriage to Peter Cook ended in 2008 after he had an affair with an 18-year-old; he went on to wed Suzanne Shaw. Shaw stood by Cook's side during the 2012 Cook-Brinkley court battle over child support, and things got ugly: At one point Brinkley told Shaw in a court hallway, "When you find out he's been cheating on you, I'll be here for you." Shaw responded, "Come up with a new line"; Shaw also said that her own marriage to Cook had been marred by Brinkley's "black cloud of hate." Only, um, Shaw and Cook filed for divorce this year ... after Cook allegedly cheated on Shaw. Now Shaw has apologized to Brinkley for bad-mouthing her years ago, Page Six reports. "Christie and I have talked recently and I have privately apologized to her, but, given the public nature of their divorce and custody battle, I feel a public apology is also appropriate and deserved," reads a letter from Shaw obtained by the New York Post. "Christie was wrongly vilified as being an embittered ex-wife. I now believe she had every right to do what she did by taking a public stand," Shaw writes. "Unfortunately, I fell under Peter's spell, but now that the reality of who he is has been revealed, I regret my involvement." Click for more on the latest cheating allegations against Cook.