It was no secret how sweet of a boyfriend Grant was to you! On your birthday he threw you a surprise-party, and some periods when he was filming, he would surprise you with a little visit. Some of his many surprises stayed private, though some of them became public.
When Grant answered the interviewer, he got happy and a bit carried away. He danced when he had mentioned the word dance and smiled at the word 'love'. You being on the other side of the red carpet blushed and laughed at your boyfriend's loveable dorkyness.