Lindsay Skips her "Fathers" Memorial Service to hang with a Jackass!

Lindsay Lohan may have thought of her "A Prairie Home Companion" director Robert Altman as a father figure, but she didn't show up for his memorial service here Tuesday - and was out partying in L.A. with "Jackass" badboy Steve O instead. After Altman's death in November, Lohan released a statement that he "was the closest thing to my father and grandfather that I really do believe I've had in several years."

A source sneers, "If he was so important to her, where was she?"

She was spotted leaving The Roosevelt Hotel with Steve-O -- a curious companion for someone straight out of rehab. The "Jackass" star was seen in the backseat of Lohan's Mercedes as the fiery starlet drove off after a night at Teddy's nightclub. Also at Ted's; sultry Penelope Cruz and former "Buffy" kid-sis Michelle Trachtenberg.

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