CHERYL Cole uses a clever leather ploy to get noticed — teaming skin-tight black leggings with electric blue suede boots. The Geordie beauty, 29, managed to turn heads from every ankle as she strode through Los Angeles airport in her look-at-me footwear. And still on the subject of the nu-buck in her life... speculation is rife that the Girls Aloud singer’s boyfriend Tre Holloway will propose this year. The Sun told last month how dancer Tre, 27, had planned to pop the question at Christmas but Cheryl’s mum Joan, 52, wanted him to wait. The Sun