Lindsay Lohan and Samantha Ronson can't keep their hands off each other in Chicago!

People:
Lindsay Lohan and girlfriend Samantha Ronson didn't hide their affection as they spent the weekend rocking out in Chicago. The couple was in town for Lollapalooza, Chicago's annual three-day music festival, which also drew Pete Wentz and Ashlee Simpson to town. Mixing some work with play, Ronson was spinning at Crimson Friday – with Lohan in tow – before they hit Underground that night. The duo hung out at the the MOTOROKR Lounge at Underground with Danny Masterson and singer Kenna before settling into a table for the night. "They were holding hands and very affectionate with each other," says an onlooker. Samantha's brother Mark Ronson was the club's deejay. The next night, they joined Mark and his girlfriend at China Grill Chicago for Diesel's Rock The Vote Private Dinner. "They were very comfortable, very touchy-feely," says a source, who added that Lindsay looked "great." "They were holding hands the entire night. They weren't hiding anything."