Christie Brinkley had everything she wanted: a family and an old Hamptons farmhouse brimming with children's music and art and beloved pets. But at her divorce trial yesterday, she testified that her life-long dream of a ''big, happy family'' in a quaint setting was cruelly ripped away when her husband had an affair with a teenager.

''Anyone who would run the risk of destroying this wonderful life, anybody that would chase a teenager I mean, a young girl where is his judgment?'' she said.

The former Sports Illustrated swimsuit model and architect Peter Cook are arguing over custody of their two children and other issues in a divorce trial that has produced a series of salacious revelations.

Brinkley's trip to the witness stand was not as explosive as some of last week's testimony, but it did contain some juicy details.

Brinkley portrayed Cook as inflexible about the children, saying he once refused to change his visitation schedule to let their son, now 13, attend a Billy Joel concert last year at the boy's private East Hampton school. Joel and Brinkley were married in the 1980s and had a daughter together.

But before Cook's affair burst into the tabloids and sank their marriage, Brinkley described him to an interviewer as ''just the greatest father''.

Cook's lawyer, Norman Sheresky, asked whether she'd meant it.

''Partially,'' Brinkley said, explaining that her admiration waned in the latter years of their marriage. AP