After calling off their engagement this past August, Rachel Bilson and Hayden Christensen are back together.

A source tells People that the duo are dating again, and Christensen was seen leaving Bilson's house in Los Feliz last week, which made us wonder.

There have been all sorts of rumors about these two, but we're hearing the main reason behind their split was the distance between the two -- Rachel lives in LA while Hayden resides in Canada.

Christensen and Bilson met on the set of Jumper in 2007, and got engaged in December 2008.

Despite the fact that he's not the best actor, dreamboat Hayden Christensen continually has number one movies at the box office! First the Star Wars flicks, then Jumper and now Takers...

Rachel Bilson's ex dropped by Katsuya for dinner Tuesday night with a male pal, but no lucky lady by his side. Guess Sophie Monk was busy?

In the midst of a summer heatwave, you'd think all the hot men would be going shirtless, but instead they're donning suits and we gotta say -- we like it!

Hayden Christensen looked more suave than ever after leaving Live With Regis & Kelly this morning where he was promoting Takers.

And White Collar's Matthew Bomer may have been in costume, but we don't mind a sharp-dressed man!

But of all the suited up hunks, there's one that we think is sexier than the rest:

Wedding bells won't be ringing anytime soon for Rachel Bilson and Hayden Christensen.

Rachel's rep confirms to X17online, "Yes the engagement is officially off."

Bilson, 28, and Christensen, 29, announced they were tying the knot back in 2009. However, in 2008, the couple briefly separated after hitting a rocky patch in their relationship.

Back in June at a Los Angeles premiere, Bilson showed up on the red carpet not wearing her engagement ring. When asked how the wedding plans were going, she replied, "No, no plans. No nothing." That may have been a hint.

I mean, really! Sophie Monk is a gorgeous girl and all but this ensemble is ridic.

Hayden Christensen, who's rumored to be on a break with O.C. actress Rachel Bilson, attended the premiere of his latest flick Takers in Hollywood last night, followed by the afterparty at Boulevard 3 with Sophie. Hot new couple alert?

Sidebar, loves her darker hair! Even though Soph was wearing these same jeans the last time we saw her...

Hayden Christensen and his fiance Rachel Bilson are cooling things off ... at least for now, according to UsMagazine.com.

The two have been engaged since February 2009 but now, they're "taking a break."

Just last night, Bilson, 28, walked the red carpet of the Take No Prisoners event without her engagement ring.

According to the mag, when asked about her upcoming wedding plans, she replied while pointing to her bare hand, "No, no plans. No nothing."

A source also says that Christensen and Bilson are "taking a month off" and will decide after that whether their engagement will continue.

Hayden Panettiere and her boyfriend Wladimir Klitschko posed at the 2010 World Music Awards, and even though Heroes just got cancelled, the recently shorn blonde was all smiles. We're gonna miss the sexy cheerleader though...

Last night Hayden Panettiere and boyfriend Wladimir Klitschko dined at Boa, and it looks like the spotlight isn't affecting their relationship at all! Then again, Hayden is a seasoned pro and her boxer boy toy is a bit older than her, so we could have predicted this...

But will they be able to work around a 14 year age difference (not to mention a foot and a half height difference)? Time will tell!