Lady Gaga and Bruno Mars Team Up for 'Die with a Smile' Video — Watch! Lady Gaga Debuts Dark Hair While Showing Off Bruno Mars T-Shirt — and Fans Think It's a Collab Hint ...

Lady Gaga and Bruno Mars have joined the country ... voluminous hairstyle and a blue dress with a statement red pussy-bow and tights, while Mars wears a coordinating suit and cowboy hat.