Kim Kardashian was left stunned when she received an unexpected marriage proposal during her outing at Summerfest this weekend - despite being single for months.The reality TV superstar has been spotted out at the festival, watching SZA perform, just months after it was reported her previous romance with Odell Beckham Jr ended. And sharing an insight into her night at the festival, the 43-year-old star shared snippets of to her Instagram on Sunday for her 362 million followers to enjoy.