In the "Lost in Translation" we can see Charlotte (Scarlet) goofing with Bob (Murray) in the karaoke bar - we can see that she is rather trying to have fun than perform well.
In "The Other Boleyn Girl", when forced to sing in front of the queen (who knows, that she is supposed to be a new king's lover), she sings weakly, with causes other ladies to snicker and the queen to sarcastically comment "bravo... a nightingale" (at around 2:15)
But then Scarlet arguably CAN sing and even published an album - you can hear it for example here:
So, has she ever sung well in a movie? By "well" - I mean in a way, that wasn't purposefully bad and was well accepted by other characters?
To precise: in "LiT" Charlotte is not trying to be a good singer, in "tOBG" Mary is trying to sing well but is played in a way which makes the effect obviously bad. I am asking has Scarlet's character tried to sing well and the effect wasn't badly received in obvious fashion (snickering, embarrassed looks etc) by other movie characters - was it good or bad for the viewer is not relevant.