Sienna Miller misses her boyfriend so much she sends him text messages every few minutes. The "Factory Girl" actress, who is currently in Los Angeles filming her new movie "G.I. Joe," is missing "Notting Hill" actor Rhys Ifans so much she wants to stay in constant contact with him every minute of the day.

One time, Miller, 26, reportedly sent Ifans 53 text messages in just eight hours.

A friend of the actress tells Daily Mirror, "Sienna is missing Rhys massively and they have stayed in constant contact. She boasted that they sent each other 53 texts in the space of eight hours. Everyone's been saying she must have had smoke coming out of her mobile."

"We've also been telling her that if she doesn't calm down she'll end up with repetitive strain injury - and won't ever be able to text him again!"

That must have gotten her attention. To ease the strain on her hand, Miller now uses her "wrong" hand to text the actor.

The source continues, "Sienna's started trying to use alternate hands to give her thumbs a bit of a break."

The loved-up actress has been dating Ifans since 2007.

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