Britney Spears gave the shortest show yet on her "comeback" mini-tour last night in L.A.-- and TMZ spies report that none other than Lindsay Lohan was there to catch the action -- all 11 minutes of it.

Our eyes inside noted that Brit donned a new wig for her big show at L.A.'s House of Blues, and that it managed to stay on without the aid of a headband. There were no naughty references to drug use, as had been reported from another show, and Spears left the stage with a terse, "Thank you L.A."

Meanwhile, Britney's aunt, Chandra McGovern, tells "Inside Edition" that the pop star's family has been "very disappointed" in Brit's crotch-flashing, head-shaving, SUV-slugging antics. "It was a rebellion against everybody," says Aunt Chandra of the bald head.