Kanye West gushed over wife Kim Kardashian as she celebrated her 40th birthday on Wednesday, October 21.“Been doing empty stadiums,” the rapper, 43, tweeted alongside a throwback photo from the pair’s October 2013 engagement. “Happy 40th birthday!!! I love you so much.”The Chicago native got down on one knee in front of Kardashian’s friends and family after renting out San Francisco’s AT&T Park on the reality star’s 33rd birthday.