<p><span></span>Justin Theroux certainly knows the way to his lady's heart!</p>
Just four days after Justin proposed to his girlfriend, Jennifer Aniston, on his 41st birthday, Life & Style, on newsstands tomorrow, can reveal exclusive details about Jen's much-talked-about ring!
"It's a huge emerald-cut diamond," a friend of Jen's tells Life & Style. "It's a rectangle with tapered diamond baguettes on the sides."
The source estimates the ring to be 8 carats, adding, "It's beautiful."
And the 43-year-old actress is beaming with happiness.
"Just after Jen got engaged, she called all her friends and told them about it," the friend reveals. "She was so happy and said she loves the ring. I think she was overwhelmed and overjoyed by the size and beauty of it!"
Though the duo are very protective of their personal lives, Jen has revealed just how great it is to be in the relationship.
"I'm very happy," Jen has said about her personal life with Justin. "I'm extremely lucky, and I'm extremely happy."
"Having experienced everything you don't want in a partner over time, it starts to narrow down to what you actually do want," she's also said. "As I get older, I realize what qualities are important in love and what suits me -- and what I won't settle for."
The couple have been dating for more than a year since meeting on the set of Wanderlust in May 2011. Before meeting Jen, Justin dated Heidi Bivens for 14 years. Jen was married to actor Brad Pitt in 2000 and finalized their divorce in October 2005.
For all the details on Jen's engagement, pick up this week's issue of Life & Style, on newsstands tomorrow!
Photo credit: Startraks