Anthony Weiner’s online paramour took time out from her “15 Minutes of Fame” tour to cool off on a Santa Monica beach — looking more like a frumpy schoolmarm than sultry sext kitten. Sydney Leathers — who sent Weiner a racy, bun-baring shot of herself in a pink thong during their 6-month dalliance — sported this unflattering two-piece halter bathing suit with high-waisted, cover-it-all-up bottoms late last week.