Lindsay Lohan leaving the Arcade Store in West Hollywood (8/10)

Lindsay Lohan and Sam Ronson were acting hot and heavy over the weekend in Chicago awww who the fuck cares. From the Chicago Sun Times:

Lindsay and Sam sat side-by-side throughout [Samantha's birthday dinner at Hub 51], occasionally leaving the table for smoke breaks and to steal kisses outside.

"They kept smiling at each other and holding hands," a source tells Star. "It was very sweet. Not only did Lindsay make a toast to Sam, but because Lindsay was so caught up in the moment, she Twittered a special message to Sam to let her know how happy she was.” The lovebirds capped off the meal with Martha's Carrot Cake, and Lindsay went nuts with the whipped cream, licking it off her fingers. “I love it on everything!” she said.

Following dinner, the group headed to Crimson Lounge, where Sam had a deejay gig from 10:30pm-1:30am and Lindsay watched from a nearby booth.

“Whatever happened during their separation did wonders because Sam and Lindsay were completely different people,” the source continues Star. “Not only were they totally at ease with one another, but this was the first time Lindsay wasn’t constantly clinging to Sam while Sam was working. As for Lindsay, this was the first time I have seen her calm and not freak out the second Sam goes into the DJ booth. It was like Lindsay felt secure with their relationship, so she let Sam do her thing.”

I guess the old adage is true: absence does make the fist grow fonder. The fact that Lindsay licked whipped cream off Sam's finger might have been sexy if Sam's finger hadn't been tickling Lindsay's spleen just a few hours prior . . . and if the thought of Sam turning Lindsay into a hand puppet didn't make my stomach turn. For those of you wondering what it looks like when Lindsay and Sam have sex, here's a re-enactment.

[WENN]