Prince William and Princess Catherine may have stepped out with Hollywood's biggest stars on Sunday night, but they could hardly have any fun amid the stress of Andrew Mountbatten Windsor's arrest! On Sunday, the Prince and Princess of Wales were seen at the BAFTA Awards, where they were asked about the film Hamnet, which follows William Shakespeare and his wife Agnes Hathaway as they deal with the heartbreaking death of their 11-year-old son. Admittedly, William hadn't watched it yet, he said per DailyMail.com: "I need to be in quite a calm state and I am not at the moment." It's unclear if this comment had anything to do with the royal controversy, but it wouldn't be shocking if it did considering the timing. Related: Ghislaine Maxwell's Brother Slams Royals For Not Supporting Andrew However, the film is quite emotional, something Kate Middleton learned the hard way. She said: "I thought it was a bad idea, actually. Ended up with very puffy eyes. It was so beautifully shot. The music as well. The score is fantastic." Aw! View this post on Instagram A post shared by The Prince and Princess of Wales (@princeandprincessofwales) View this post on Instagram A post shared by The Prince and Princess of Wales (@princeandprincessofwales) Unfortunately, because of Andrew's recent arrest, they're both dealing with a ton of stress that impacted their night out. As Perezcious readers know, the former Duke of York was taken into custody on suspicion of misconduct in public office for revelations discovered in the Jeffrey Epstein files. He was released but remains under investigation, which King Charles III has been supportive of. Kate and Will were said to be in support of Charles' statement, as well. Now, a royal source is opening up to DailyMail.com about the behind-the-scenes ongoings of the family. They said on Monday: "William is frustrated because it's still likely to be a problem on his plate when he eventually becomes King. I'm sure the Prince and Princess of Wales have been itching to say something publicly to distance themselves but they have to be cautious because of the police investigation. I think William and Kate are acutely aware that this is a scandal that won't be going away for a long time. It's a mess left by Andrew and the late Queen and, although His Majesty is very much in charge, William is frustrated." Addressing the award show, the source noted: "The Princess looked so elegant but you can see that this is all causing strain and that's the last thing she needs." A second source said the couple's biggest concern right now is the well-being of Charles, who has been battling cancer: "Obviously William is not feeling calm and he would have spoken on behalf of them both. It's a terrible situation and they are very concerned about the health of the King and the impact this will be having on him. He is exhausted and it's draining for him." It's also an emotional weight to bear for the parents of three, the source elaborated: "Also as parents of young children, to be reading all of this is pretty awful and they are clearly concerned. William let this slip out last during a conversation and he would have done that on purpose, that is very clear. But Catherine has kept very quiet." It's a lot for the family to wrap their heads around, and it certainly poses lots of problems for them as they push the monarchy past this scandal. A lot is riding on their next moves... Reactions, Perezcious readers? Leave them in the comments (below). [Image via MEGA/WENN] The post REVEALED: 'Frustrated' Prince William & Princess Catherine's Biggest Concern After Andrew's Arrest! appeared first on Perez Hilton.