Jennifer Aniston joins John Mayer on tour in the UK

Jennifer Aniston has flown to the UK to be with her new boyfriend John Mayer while he's on tour. Mayer performs in Birmingham tomorrow and has four more dates in the UK this week before he's scheduled to start his US tour in July. Bang! showbiz reports that Aniston was seen arriving at Heathrow airport this morning.

Aniston, 39, has introduced Mayer, 30, to her former costar and best friend Courteney Cox and her husband, David Arquette. The two had dinner at Courteney and David's house early this month and were also spotted out at a restaurant with them. Aniston and Mayer went public with their relationship at an event on June 12. They took a private jet to Mexico the next day and enjoyed a vacation at Joe Francis' estate in Punta Mita.

Another sign that they're getting serious is the fact that she supposedly introduced him to her dad, according to Star Magazine. Star also says that Aniston accidentally proposed to Mayer, so take this for what is is. They do have an actual date for the meeting, which makes it seem like it could be true:

Former Days of Our Lives star John Aniston, 74, suffered a heart attack in the summer of 2006 and "Jen worried about her dad and likes to check in," a source explains. And during a June 1 visit, she brought her new man. "They had a pleasant time. They talked about music. Jen was happy with the results - she said her dad really liked John."

[From Star Magazine, print edition, June 30, 2008]

And here's the bs part where Jen proposed to John by mistake:

"Things have been going so amazingly well between Jen and John, she just feels like it's right," an insider reveals. "They're already saying 'I love you,' to each other."

And during a recent romantic stroll on the beach in Malibu, "the words 'I want to marry you' just tumbled out of Jen's mouth," the source adds! But the impromptu proposal was met with an uncomfortable silence. "Unfortunately for Jen," the source explains, "John doesn't share her desire to get married so quickly!"

[From Star Magazine, print edition, June 30, 2008]

I know that's not true, but it's such a good fake story that I couldn't resist repeating it.

Jennifer Aniston is shown at LAX yesterday, thanks to WENN.