No, she wasn't pregnant in February, but she would have been in August if the picture was taken for Mark's birthday. So it had to have been taken shortly after the wedding.
This is what the newspaper says:
MARK'S BACK HOME WITH NEW BRIDE
"Dire Straits guitarist, Mark Knopfler, sports a City wideboy pin-striped suit to step out with new wife Kitty Aldridge.
The couple were celebrating Mark's 48th birthday in London. It was their first night on the town since their honeymoon. The millionaire rock star and third wife Kitty married on Valentine's Day in Barbados."
A friend of mine was pregnant recently and up until the 8th month, nobody would notice it. She even posted pictures and all! So I guess it depends. Anyway, that situation perfectly demonstrates that you do not want to know anything about the private life of your idols. In Russia, we have a saying that basically reads "everybody's masturbating as he wishes", no sexual context here, it just means that everybody lives their private life as they wish and nobody needs to comment on it, though it also means you don't want to announce it either...
In that regard, I think, my philosophy is pretty close to Englishmen with their extreme views on privacy.