While Stewart attended the Elle Style Awards alone last night, Pattinson was busy working all day on his new film Bel Ami.
Romance rumours have surrounded the couple since the first Twilight movie came out in late 2008.
Hair expert Gary Heron from The Hair Centre in Westminster said after seeing the pictures of Kristen: 'It appears Kristen has telogen effluvium.
This means the growth of hair is interrupted prematurely and the growth cycle isn't as it should be.
After months of speculation, Robert Pattinson has finally confirmed he is dating his Twilight co-star Kristen Stewart.