Star Magazine reports that Justin Timberlake and Jessica Biel are heating it up despite their brief break while Justin hooked up with Scarlett Johansson – and Jessica had a fling with Ryan Reynolds. Now Scarlett and Ryan are said to be a new couple with Justin and Jessica are back together.

Justin even took care of a pit bull puppy for Jessica while she was out of town. The article claims that Justin wanted Jessica all along, but that it took her a while to “warm up to him.”

Jessica is even wearing Justin Timberlake’s brand of William Rast jeans, and she has “sexyback” as the ringtone on her phone:

Justin Timberlake and Jessica Biel are definitely a hot couple – so hot that she’s wearing his personal brand of designer jeans, they’ve been spotted kissing and canoodling all over, and he’s even tended to one of her beloved pet pit bulls! “It’s a puppy she adopted from a shelter,” says a source. “Justin looked after it for a few days when she had to go out of town. The gesture really pleased Jessica!”

It seems that Justin, 26, who’s also been linked to sexy Scarlet Johansson in recent months, has been working overtime to convince Jessica that he’s after more than just a fling. “Justin was crazy for her from the start, but it took Jessica a while to warm up to him,” says the source. “He kept calling, and she finally realized, ‘Wow, he must really like me!’ Now, she lights up whenever his name is mentioned.”

[From Star Magazine print edition, April 30, 2007]

The article goes on to say that they have been “quietly dating” since Prince’s Golden Globes after party on January 15th, and that lately they’ve been seen kissing in public.

Justin is going on a two month tour starting this month, though, and while Jessica will visit him she won’t be joining him the entire time. She does have “sexyback” as the ringtone on her phone according to witnesses, so it sounds like she wants to be reminded of Justin as much as possible.

The National Enquirer reports that Scarlett Johansson’s fling with Ryan Reynolds is just a ploy to try and make Justin jealous. They say she never got over him and that Scarlett and Justin still text message and talk on the phone constantly:

Do not be fooled by Scarlett Johansson’s current cuddles with hunky Ryan Reynolds – because the Sexiest Girl Alive’s still heart-locked to Justin Timberlake, say pals! Scarlett’s dalliance with Alanis Morissette ex Ryan is a plot in her secret plan to keep Mr. SexyBack wild with jealousy (and distracted from hotties liek Jessica Biel) while he’s off on tour! Scarlett and JT still sexy-talk constantly via phone and text-messaging – and Reynolds is just a ruse. “Scarlett’s absolutely nutes about Justin,” reveals one insider. “She’s just turning the tables on him. She doesn’t want the boy taking her for granted.”

[From The National Enquirer print edition, Mike Walker’s column, April 30, 2007]

So which is it? Is Timberlake with Biel or Johansson? I vote for Biel, and say that The Enquirer has old or inaccurate information. You never know with these young hotties, though, Timberlake could be playing both of them.

Here’s Jessica Biel out with her dog. [via]