Britney Spears says she hurt her knee badly after taking a tumble at her friends house ... but, it's alright now -- 'cause she says it popped back into place??? The singer-songwriter shared another dancing video to her Instagram Sunday ... wearing a low-cut pink dress which ended high on her powerful thighs. She's wearing white fingerless gloves in the clip ... and, she twirls her hands around -- putting her hands up in prayers at times while seemingly coaxing in the audience with "come hither"

Tag-uri: Instagram