The actress, 27, went head-to-head with the show host in the challenge that saw them throwing axes at a target in order to score points.

Jimmy started things off with a toe curling shot right between the legs, the effigy almost breathing a sigh of relief as it stuck pointlessly millimeters beneath the groin.

But spurning Fallon’s one handed approach, Jen instead opted for an unusual two-handed grip – but to no avail.

Look out! The duo took it in turns to step up to the wooden target and throw an axe at the cowboy printed on it to win points

And aim…: Jennifer geared herself up for her first throw while donning protective goggles across her eyes

Unique technique: The actress appeared to get to grips with the axe before lobbing it over her head and at the board

Taking tips? While she favoured a two-handed throw, Jimmy appeared to be more successful with his one-handed technique

Face off: Jennifer and Jimmy had the studio audience highly amused as they geared up for their contest

Chasing a win: Jennifer was itching to be victorious, as she told the show host she would keep going until she had beaten him

She failed to strike the board, with her frustration only building as Jimmy secured himself the win by landing his axe on the target’s head.

Storming around the set, Jennifer amusingly was left screaming in dismay, angrily pulling out Jimmy’s winning axe and repeatedly hitting the target’s head with it – making sure to win a laugh from the studio audience.

Despite her challenge fail, the Silver Linings Playbook star was definitely a hit on the sartorial front.

She looked sensational for her appearance on the Tonight Show and stepped out on set clad in a 𝑠e𝑥y sequinned black suit.

Better luck next time? Despite her determination, Jennifer didn’t manage to score at all and was left furious when Jimmy secured his win by hitting the target’s head with his axe

Entertaining: Screaming as she stormed around on set, Jennifer put on an amusing display in her defeat

Winner! Jimmy had secured points by hitting the target in an eye-watering manner between its legs, before hitting its head straight on

Champion: Host Jimmy made sure to reveal in his glory, much to Jennifer’s annoyance

Hot: Despite her challenge fail, the Silver Linings Playbook star was definitely a hit on the sartorial front

Stylish: She looked sensational for her appearance on the Tonight Show and stepped out on set clad in a 𝑠e𝑥y sequinned black suit

Her glittering two-piece teamed together tailored trousers and a matching blazer jacket. And stealing a glimpse at her incredibly toned stomach, she chose to don a complementing crop top underneath

Jennifer swept her blonde tresses back from her face in a tousled up-do and sported a glamorous make-up look that accentuated her natural beauty and came complete with a glossy nude lip.

During her appearance on the show, the acting talent had spoken about her latest film Mother!, written and directed by her boyfriend Darren Aronofsky.

The psychological horror also stars Javier Bardem, Ed Harris Michelle Pfeiffer, Kristen Wiig, and brothers Domhnall and Brian Gleeson.

Gorgeous: Her glittering two-piece teamed together tailored trousers and a matching blazer jacket

Beauty: Jennifer swept her blonde tresses back from her face in a tousled up-do and sported a glamorous make-up look that accentuated her natural beauty and came complete with a glossy nude lip

New release: During her appearance on the show, the acting talent had spoken about her latest film Mother!, written and directed by her boyfriend Darren Aronofsky

It tells the story of a young woman (Lawrence) and her husband (Bardem), whose tranquil life at their remote country home is challenged by an unnamed couple (Harris and Pfeiffer) who arrive and lodge with them.

Jennifer’s appearance on the Tonight Show comes after she had attended Venice Film Festival with her beau Aronofsky to promote their new release.

The couple embarked on a relationship privately in September 2016 after filming for Mother! had wrapped and while she is famously tight-lipped about her romantic life, Jennifer recently opened up about her romance with the director in an interview with US Vogue.

Smitten: While she is famously tight-lipped about her romantic life, Jennifer recently opened up about her romance with the director in an interview with US Vogue

Speaking about their new horror film to the magazine, the actress admitted she could not believe his ‘brilliance’ on set, before gushing about him as a boyfriend.

She said: ‘When I saw the movie, I was reminded all over again how brilliant he is. For the past year, I’ve been dealing with him as just a human.’

Before adding sweetly of their romance: ‘I’ve been in relationships before where I am just confused. And I’m never confused with him.

Sweet: Speaking about their new horror film to the magazine, the actress admitted she could not believe his ‘brilliance’ on set, before gushing about him as a boyfriend

Besotted: She said: ‘When I saw the movie, I was reminded all over again how brilliant he is. For the past year, I’ve been dealing with him as just a human’

‘We had energy. I had energy for him. I don’t know how he felt about me.’

Director Aronofsky was previously in a relationship with actress Rachel Weisz, 47 – who is now married to Bond actor Daniel Craig, 49 – for nine years.

Meanwhile Jennifer dated X-Men costar Nicholas Hoult, 27, from 2010 to 2014 and was later linked to Coldplay frontman Chris Martin, 40, for a year before breaking up in summer 2015.