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9 June 2012, 23:38 | Updated: 10 June 2012, 17:15
Kelly Clarkson thrilled the Wembley Stadium crowds today (9th June) with a live rendition of her recent hit single 'Mr Know It All'.
'Since U Been Gone' star Kelly released the song in October last year as the lead single from her fifth studio album 'Stronger'.
'Mr Know-It-All' has proved a big success for Kelly on both sides of the Atlantic, becoming a hit on the Vodafone Big Top 40 as well as giving Kelly her ninth top ten hit on the US Billboard Hot 100.
Watch Kelly Clarkson performing 'Mr Know It All' live at Wembley Stadium for the Summertime Ball 2012 below and scroll down for more Kelly Clarkson performance footage at the Summertime Ball 2012.