The 23-year-old will join the club on 3 January 2015 from French side Montpellier, having previously plied her trade at Queen's Park, Celtic and Arsenal.
The daughter of former Scotland and British Lions rugby union player John and sister of Scottish rugby union international Johnnie, the versatile right-footer is admired for her height, strength and impressive goalscoring ability.
Having already enjoyed a glittering career, Beattie is eager to add to her trophy collection and feels she can do so with last season's Continental Cup champions.
"Once you've had that taste of success, you want it more and more," she stated. "City have their targets set on winning trophies and that's the kind of club I want to be at.
"I'm very excited. The girls did great last year, it's a really exciting time and I'm really happy to be a part of it.
"The facilities at the club are just unbelievable and it's a really good time to try and make your mark on a club. I'm ready for a new challenge and I'm looking forward to returning to the Women's Super League. I've missed it.
"I know some of the girls already and I played alongside
In her schooldays, Beattie was selected as captain of the Glasgow Primary School side, despite being the only girl on the team. Having played for Hamilton Academical's boys teams, she embarked on a senior career with Queen's Park's women's side.
At the age of 15, she competed in the Scottish Women's Premier League and Scottish Women's Premier League Cup before joining Celtic the following January and clinching two domestic trophies.
She then made the move to Arsenal in 2009 where she enjoyed her most successful period to date, securing seven major honours, scoring a variety of stunning goals and memorably netting hat-tricks in famous victories over Chelsea and Barcelona.
Beattie also brings with her a wealth of international experience, having notched more than 80 appearances for her national side.
The youngster describes her playing style as physical, communicative and attack-minded - evident with her fine goalscoring record.
"I'm always looking to get forward as well in an attacking style of play so I'm hoping to implement that," she declared. "And who doesn't love scoring goals? Any opportunity I get to go forward, I'm more than happy to.
"I just can't express how excited I am for a new challenge and I can't think of a better club to be a part of. I'm really looking forward to it."
Reflecting on his latest capture, manager Nick Cushing asserted: "We are delighted to add Jennifer to our squad for the 2015 season.
"We have done a lot of reviewing of the last season and we have highlighted areas we needed to improve as a team. Jennifer was a key target for us, when considering how we continue to evolve this team.
"Her previous experience at club and international level is exceptional and we all look forward to working with Jen."