The signs are everywhere that summer blockbuster season has ended. The alien-invasion tale Signs climbed back to the No. 1 spot at the box office with a $14.4 million haul in its fourth weekend, while the espionage thriller XXX, the top film for the last two weekends, came in a close second with $13.7 million, according to studio estimates Sunday.

        The weekend's three new movies debuted weakly. Elizabeth Hurley and Matthew Perry's romantic comedy Serving Sara was No. 6 with $6.1 million; the Wesley Snipes-Ving Rhames prison boxing drama Undisputed was No. 8 with $4.7 million; and Al Pacino's Hollywood satire Simone came in at No. 9 with $4.1 million.

        Signs now has taken in $173.2 million, while XXX climbed to $106.7 million, the 13th movie released this year to top $100 million.

        Estimated ticket sales for Friday through Sunday at North American theaters, according to Exhibitor Relations Co. Inc.

        1. Signs, $14.4 million.

        2. XXX, $13.7 million.

        3. Spy Kids 2: The Island of Lost Dreams, $7.8 million.

        4. My Big Fat Greek Wedding, $7.6 million.

        5. Blue Crush, $6.5 million.

        6. Serving Sara, $6.1 million.

        7. Austin Powers in Goldmember, $5.6 million.

        8. Undisputed, $4.7 million.

        9. Simone, $4.1 million.

        10. Blood Work, $2.9 million.

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