Beyoncé's mother Tina Knowles has melted hearts after sharing a sweet video of herself cooing over her "beautiful grandson".MORE: Beyoncé's daughter Blue Ivy dances to famous mum's song in must-see videoThe mother-of-two took to Instagram to post the cute footage, showing her cradling baby Noah – the youngest son of Kelly Rowland.Tina is incredibly close to Kelly and has often referred to her as her third daughter, and considers her children her grandkids. VIDEO: Take a look inside Kelly