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This isn't exactly a love triangle, but it's definitely a friendship triangle! We've reported in the past that Lindsay Lohan is jealous of Samantha Ronson's close relationship with Nicole Richie, and it looks like their recent night out has Lilo seeing red!

Last Friday, Sam, Nicole and Joel Madden partied at Playhouse in Hollywood, where the group did shots of lemon drops and danced together in the VIP room. Eyewitnesses tell Fox411 that Sam and Nicole were "acting like best friends, a scene that put Lindsay Lohan over the edge once she heard about it."

A source tells Fox, "When Lindsay found out that Sam was out with Nicole, she was not happy! Since Lindsay's return to court last week, she has to be extra careful for probation, and [hearing about] Sam out with Nicole hurt her."

So what's Nicole think of all this? "Nicole has made it very clear to Lindsay and to their mutual friends that she wants a better life for her," the source says. "Nicole hopes Lindsay will get it together and change her behavior, but until she makes a change, Nicole avoids her. Sam and the rest of the Ronson family have remained close to Nicole, Joel and his brothers." So basically, it's up to Lindsay to change her ways ... makes sense to us!

"Sam loves Nicole and Joel and she cares deeply about Lindsay," the source continues. "She in no way wants to hurt her, but Sam will not drop her friendship with Nicole. Lindsay takes her hanging out with Nicole personally [and] as an attack on their on/off relationship."

Think we'll ever see Lindsay get her life together and rekindle her friendship with Nicole? If Nicole was able to turn her life around, there's certainly hope for Linds, right?