"Lindsay and Sam are not reuniting at this point," Powers said, "but Sam is there to support her and get her through rehab."
It's a familiar role for Ronson, who was nearly inseparable from Lohan after the last time she went to rehab. Their close friendship grew into a relationship. But after many public spats, Ronson finally called it quits last spring.
Lohan's father Michael Lohan for one was glad, but since the breakup, it seems Lohan has been spiraling downward.
Could Lohan's latest crisis bring them back together?
Powers cautions that although "Lindsay is going through a tough time and they are talking a lot," the couple has certainly had "rocky moments" in the past. That said, they have a better chance of reuniting than the next couple.
Rihanna and Chris Brown
Last week there were Internet rumors that Rihanna had spoken by phone with her ex Chris Brown for the first time in almost a year after seeing his emotional performance at the BET Awards.
Rihanna's rep reportedly denied the rumors.
But it wouldn't be the first time Rihanna reunited with Brown after he assaulted her in February 2009. Weeks after she was bloodied and bruised, Rihanna was photographed spending time with Brown at Sean "Diddy" Combs' Miami mansion.
Not so, this time, said Powers.
For one thing, Brown, who pleaded guilty to felony assault last August to avoid jail time, is forbidden from contacting Rihanna while he's on probation for four more years.
"At this point, it's probably pretty slim," Powers said. "Even though they both admitted they were each other's first loves, it was a pretty contentious breakup. Besides, I feel as if she's moved on."
That would be because of Matt Kemp, the pro baseball player Rihanna has been dating and credits with keeping her grounded since her breakup with Brown.
Mel Gibson and Oksana Grigorieva
If Rihanna and Brown are a "longshot," Powers said there is "no way" Mel Gibson and his ex-girlfriend Oksana Grigorieva, the mother of his infant daughter, are getting back together.
Like Brown, Gibson is under investigation for a possible domestic assault against Grigorieva in which he allegedly broke her teeth.
Regardless of what the investigation finds, their fate as a couple has already been sealed by leaked audio tapes in which Gibson can be heard spewing hatred and vitriol. Besides the invectives he hurls at Grigorieva, Gibson can be heard insulting blacks and Latinos.
"Those tapes are very damning," Powers said. "They had a very contentious split and it certainly seems unlikely they will get back together."