Lindsay Lohan’s birthday isn’t until Thursday. In case anyone looking at these pictures is saying to themselves “Who is that middle-aged crackhead?” – she’ll be turning 23. So Lindsay being Lindsay, she decided to go to Las Vegas more than a week before her 23rd birthday to do some celebrating. According to multiple reports, Lohan stayed by the pool at Wet Republic for most of her time in Vegas – but people did note that she did five costume changes, mostly outfits involving bikinis, hot pants or random bits of clothing that looked like Lohan had fought (and won) another crackhead for. Many sources also noted that Samantha Ronson was nowhere to seen during the parties:

When Lindsay Lohan returned to Las Vegas this weekend, she didn’t bring her most controversial accessory with her.

Celebrity watchers’ favorite scandal-prone redhead was at Wet Republic Saturday afternoon, but her on-again, off-again and apparently now former girlfriend, Samantha Ronson, was not.

Alas, Ronson has a double-gig in Atlanta this evening, and instead of joining Lohan,she sent the soon-to-be birthday girl a message via Twitter.

“Have fun,” Ronson said.

Lohan’s reply was warm: “Thanks baby!”

The former couple were last photographed together in Las Vegas by paparazzi on March 10. That night Lohan danced alongside her then-plus-one in the DJ booth as Ronson performed a guest set at Privé.

Lohan’s on-again-off-again girlfriend has returned to the turntables at the popular Planet Hollywood nightspot several times since that night, but Lohan has not joined her.

While whispers of yet another reconciliation for the duo (as well as single-sided attempts at one) have repeatedly been heard during the past few months, Saturday’s single showing would seem to be yet another indication that the couple have, in fact, called it quits and are just friends.

Lohan was at MGM Grand on Saturday to celebrate in advance of her birthday next week. The embattled and dramatic actress-singer-entrepreneur will turn 23 Thursday.

The enterprising socialite used her poolside party to promote her line of tan-in-a-can, Sevin Nyne tanning mist.

[From The Las Vegas Sun]

I think the whole tan-in-a-can thing was the real reason Lohan was in Vegas. Only Lindsay could take one evening’s promotional task and blow it out to a four-day lost weekend fueled with booze, drugs, bikinis and chlorine. Yes, it’s a little sad that this is literally the only thing Lindsay has to do – and yet, I have little sympathy. So, what do you think it means that Sam wasn’t there to celebrate? Does it mean that Sam got tired of the drama – for the millionth time? Or will Lohan’s long-term stalking pay off in the end?

Photo credit: WENN.com and PRPhotos