Jason Alexander, who was briefly married to Spears, and Shar Jackson, who is the mother of two of Federline's children, have both spoken briefly about the pending divorce battle, but now they've sat down with TV talk show host Dr Keith Ablow to comment further.
The couple, who were once linked romantically earlier this year, taped the interview yesterday. It will air on Monday.
During the chat, Jackson reveals she thinks her ex will fight hard for custody of the two sons he had with Spears.
She says, "He loves his kids and I'm sure he's probably scared that Britney might take the kids and go back to Louisiana or go somewhere and he might not see them."
Alexander reveals he spoke to Spears just after the split was announced, when she called to urge him to watch what he said to the media.
He recalls, "Actually, it was really short. How'd she put it: "Don't say anything you'd regret."
JACKSON: 'SPEARS STOPPED FEDERLINE FROM SEEING KIDS'
BRITNEY SPEARS' former love rival SHAR JACKSON has accused the pop star of keeping her estranged husband KEVIN FEDERLINE away from his kids. The actress claims Spears was so needy when she became a mum to Federline's son SEAN PRESTON, she wouldn't entertain the thought of the rapper spending time with the two kids he had with Jackson. She says, "He was in a relationship where he had to respect boundaries. And the other person probably felt that their family should be the focus of what goes on in their household. "He couldn't come over as much as he would like to. If he wasn't working he would come over to see the kids two or three times a month." Federline, who split from Spears last month (NOV06), is already trying to make up for lost time with his children by Jackson - he reportedly spent Thanksgiving Day (23NOV06) with his ex-girlfriend and their kids.