Holmes filed for divorce from Cruise on June 29 after five years of marriage. They reached a settlement yesterday (July 9), and made an appeal for privacy in a joint statement.
Now magazine reports that Holmes had intimate discussions with Victoria about her marriage prior to seeking a divorce.
"Victoria's been a real tower of strength," a source said.
"Katie's seen how a normal marriage should function by being around Victoria and David Beckham, so she knew that something was wrong with her relationship with Tom.
"She and Victoria have been talking a lot. Posh has been trying not to take sides, but she has let Katie know she'll be there for her whatever she chooses to do."
Following the divorce settlement reached yesterday, Holmes's lawyer Jonathan Wolfe has denied claims that she has received primary physical custody of the couple's daughter Suri Cruise, adding: "There are numerous inaccuracies in the reports regarding the purported contents of the agreement reached between the parties."
Photo gallery - Big celebrity break-ups of 2012:
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