I always take lone tweets by random users with a grain of salt. There are too often obvious issues with credibility and plausibility -- so much so that I don't consider them reliable at all. This one below however is not from a random user. Simon Curtis is a verified user with more on his plate to occupy his time than making up imaginary celebrity sightings. He previously posted seeing Angelina at Urban Outfitters and while he didn't take a photo, other shoppers did. If nothing else, it established that he's in the general neighborhood.
While I haven't seen other posts confirming their H&M shopping trip, I also don't see any reason to doubt Curtis' credibility. We can't be certain without a photo but it's certainly possible they are in L.A. and she and some kids went shopping at H&M.
It's a 10-hour flight from London to L.A. for them. Her voice work on Ivan is not demanding. It's a Disney production and while she's a producer, another experienced Disney producer is also working on it. She has time on her hands until Maleficent 2 starts filming.
As we noted previously, there could be a number of things they need to attend to in L.A.
Where in the world.......
Angelina Jolie is in line ahead of me at H&M and I really don’t know how we are living parallel valley girl lives??— Simon Curtis (@simoncurtis) April 25, 2018
She was taking her kids shopping! It was endearing.— Simon Curtis (@simoncurtis) April 25, 2018