George Clooney's Engagement to Amal Alamuddin "Irked" Ex-Girlfriend Stacy Keibler

George Clooney’s ex-girlfriend Stacy Keibler was “irked” by his engagement to Amal Alamuddin, a source reveals in the new issue of Us WeeklyCredit: Jason LaVeris/FilmMagic; Stephen Lovekin/Getty Images Did Stacy Keibler get played by Hollywood’s most infamous playboy? George Clooney‘s April 22 proposal to British human rights attorney Amal Alamuddin was a surprise to many, including the Gravity actor’s ex-girlfriend, who once thought she’d…