The former married couple – whose divorce was finalised in May – have reportedly been meeting at the troubled actor's California home ever since his two live-in girlfriends, Bree Olsen and Natalie Kenly, moved out.
According to TMZ.com, the 33-year-old beauty has even told friends the pair – who share joint custody of their twin sons Bob and Max – are considering the possibility of a permanent reconciliation.
However, Brooke is said to be keen to iron out the issues that caused their relationship to come to an end the first time around.
This comes after the star – who recently completed a 45-day rehab stint after battling drug and alcohol abuse – recently angered best friend Paris Hilton by not turning up on a blind date set up by Paris' then-boyfriend Cy Waits.
When confronted by the 30-year-old socialite on her reality show 'The World According to Paris' – set to air in the US tonight (14.07.11) - Brooke said: "Sometimes I really miss Charlie. I've got confusing emotions. I haven't seen him for a year."
Paris was quick to hit back, comparing the actor to "the devil".
She retorted: "When you get that stuff inside you, it's like the devil."
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Speaking to her mother Kathy, Paris later suggested Brooke is keen to reignite her two-year marriage
She said: "I understand if she wants to get back together with her ex-husband. But she shouldn't be begging
me to set her up on dates."
The argument ended with Brooke leaving Paris' Los Angeles home shouting "f**k you" at the blonde heiress.